My building had a wee little ant problem last summer, to the extent that if you left an open can of soda on the table and went to the bathroom for more than 2 minutes, it would be covered with the tiny little buggers when you got back. Yup, found out the hard way. Honestly, the worst part was that they get stuck in your teeth and are a pain to spit out. They have an almost sweet, tangy sort of taste in mass quantities that actually isn’t 100% unpleasant.
One day after school I came home and being the growing boy that I am I was looking for some food. I saw a bowl of what appeared to be corn beef on the table. I then proceeded to ask my mom what it was. She told me it was corn beef and that I could go ahead and have some. It wasn’t corn beef. It was cat food. My mom forever the prankster. 
I mentioned this in a thread a long time ago. I Got ya all beat…
Shishkabab dog in Mombasa, Kenya. It didn’t taste like beef, so I assumed it was antelope or some such thing. My buddy and I persisted, found a guy who spoke the language and he told us it was dog.
My buddy yarked. I went for seconds.
Guest contributor
Straight Dope Science Advisory Board
Does finding a cadella beatle larvae in your Campbell’s soup count?
KarmaComa: Cow Brain Burgers were actually on the menu where they went. They had gone to a local dive, and apparently, from talking to my sister-in-law, that’s where everyone went after a night of drinking. Some people actually ordered them on a regular basis. It was cooked, of course, if that’s what you mean.
Drunken Prawns in a fancy chinese restaraunt on the top of the Pan Asian hotel in Singapore.
Usually, they’re soaked in gin for a day or so, and then cooked. These were uncooked, whole, and alive. But not moving very fast … probably drunk.
I was the guest, and it was a business trip, so I ate them and professed enjoyment.
Singapore is the place where I enountered he durian, a fruit with a woinderful taste but a smell so foul that it is illegal to carry one on the Singapore subway.
jrf
After spending 10 years in the Army in Germany and the Middle East, it’s kinda hard to think of some kind of gross thing that I HAVEN’T eaten:
Dog, cat, camel, sheep eyes, snake, squid, whale blubber, rat, bear, possum, alligator, various insects raw and cooked, all kinds of birds etc…
The absolute grossest thing was when I was real drunk in Germany and chowed down a dead frog one of my buddies found on the side of the trail we were on.
You found my substance!!! Durian is so incredibly nasty, AIRLINES won’t carry them. It seems you can’t get rid of the smell afterward. I actually saw durian jelly, I can’t imagine heating the stuff! I ate some really bizarre stuff while there, fishhead curry, pig intestine (thought it was octopus) and something called “snow fungus”. Considering Singapore is in the tropics and has no snow…I just don’t want to know.
Always remember that you are unique, just like everybody else. MIPSIMS : where we put the fun back in dysfunctional.
Wasn’t gross, but was done innocently. When I was six, I drank from a Fresca bottle, not realizing that my mom had put the “dividend” from her pitcher of martinis in it.
Sing glogalimp, sing glugalump,
From deep inside the Wuggly Ump.
skingraft–straight butter is no mouth full of maggots, crunchy cockroach or a slice of man’s best friend, but it is icky. Next time you are out of candy bars, tell me and I’ll send you some. Or maybe some pudding?
I drank ten or so goldfish in one fell swoop (I was in high school and it did not seem as nasty as others thought). I have eaten Dog Food and Biscuits(not that nasty), and Saytay sauce on my chicken (it has brine shrimp in it- you can buy these at pet stores for fish food. They are sea monkeys). I also ate something from a chinese supervisor (she got back from Hong Kong, and gave me some kind of spicy/sweet brown nuggets.) she would/could not tell me what it was. That worried me, but it tasted good anyway.
Sitting in the dark.
Drinking neat blackberry brandy.
In my roach-infested apartment.
Your brain-in-a-jar,
Myron
Imbibo, ergo sum.
I forgot to mention that when I was 3 or so, and we lived in Albequerque, there were these huge drainage ditches near the trailer park we lived in. On two different occasions, my older brother and I decided to try the mounds of white powder laying in these ditches. Turns out it was pure lye. I had my stomach pumped out twice that year, so did my brother. What fun.
You are more than a human being, you are a human becoming.
Og Mandino
That’s my name, not a description. I am neither purple nor a bear. Okay, so I’m purple.<a true Wally original!>
Me? I’ll eat just about any insect for the change in your pockets.
A fraternity brother in college once one-upped me, though. On a dare, he grabbed a half-full bottle of tequila that had been left on a shelf for a couple months, sans cap, and strained about 2 shots worth through a dirty sweat sock. He drank the double shot, set the sock on fire, and then yakked the fire out.
“Hand me my wallet…It’s the one that says ‘Bad Motherf**ker’ on it.”
Once wasnt enough?? Had to go back for seconds?!?!?
Kangaroo!
Not that kangaroo can be bad, but just not what I had. I was in Australia and the group I was with ate the meat unquestioningly like good little foreigners. 
I threw it out, wondering why my beef tasted a little rotten.
Afterwards we were informed we had just eaten kangaroo for din-din. Oh yeah, that was the evening after we visited a “zoo” and got to pet the kangaroos.
Cruel, Cruel Aussies!!
ENFP Prayer: Dear God, please help me keep my mind on one - oh look a bird! - thing at a time
Well, I didn’t actually eat it, but…
Once in college I was talking on the phone and grabbed a bottle of Hamm’s (hey, we were poor) from the fridge. It was the returnable type you take back for a deposit. Anyway, as I was drinking and talking, a chunk entered my mouth. This wasn’t terribly unusual as our fridge had a habit of getting too cold, so I figured it was an ice chunk. It didn’t melt right away like normal though, so I pulled the chunk from my mouth. Turns out it was a big 'ol chunk of sludge that must have come off the machine that fills the bottle. Needless to say, I poured the bottle out. (But I did grab a fresh one, and drank from it only after putting it up toa light!)
If at first you don’t succeed - redefine success!
These things didn’t happen to me… thank goodness!
Some friends of my family went camping one weekend and made a pot of chili over the fire. They ate some and then went for a walk. When they got back they all ate some more chili. Well, it was dark by this time so they couldn’t see the pot. They noticed that their chili was kind of crunchy and the flashlight showed them a pot full of june bugs!!! Gross!!
Also, my brother found a fried cockroach in his McDonalds french fries!! He should have sued em!!
That John Denver’s full of shit man!
My personal heaving encounter. I ate one Hostess Cupcake. I remove the other one from the package and there was a live 3 inch worm wiggling in the package.
The other gross encounter involved a sealed envelope of Swiss Miss hot cocoa. I opened the sealed envelope and poured it into the hot water mixing well. I started to drink the stuff and felt lumps, so I spit it into the sink. There were dead quarter inch worms in the sink. Puke time.
My brother was eating Cambells chicken noodle soup that comes in the can. He finds a claw setting in the spoon.
A friend and I are eating at Rocky Rockoco’s, and when eating a slice of pizzia, she finds she is chewing on a bandaid.
I was deep in the Amazon rainforest of Ecuador. Our guide took us to a very small village basically made up from a man and all his wives. I got the impression that the thought the US was waaaaaay downriver. Anyhoo, our guide told us that they would give us a bowl of chicha, their beer. It’s all they drink- they wean their kids right onto the stuff. We probably wouldn’t like it, but we should at least pretend to drink it as a reciprocation for their hospitality. I had to try some, and she was right. It was sort of like spoiled milk without the chunks. But there were these fibers I couldn’t ID. Later, well away from the village, our guide told us how chicha is brewed. They harvest manioc roots, chew on them, spit it into a bucket, and let it sit a week or so. Enjoy!
A few weeks ago, in Marrakech, I had fried sheep brain. Very greasy and kinda chewy, similar to chicken fat. But I knew what I was doing.