When I see a squirrel, I speak to it only in French. Cats? German.
I pray for roadkill.
When I am home alone, I frequently speak to my children. I understand perfectly they’re not there - I just miss them. 
I always say a prayer for roadkill, too.
(Bolding mine) Yes, that was totally me. Still have the habit.
Another one is I have my own fork that’s different than the other forks and I only use that fork.
Okay I’ll bite (hehe). How is yours different? Pictures, if necessary.
when I microwave something, I never set the cook time for an even number. meaning, if I’m going to nuke it for about 4 minutes, I’ll set it to 4:12 or something.
I don’t know why.
Amen, the cup just feels wrong otherwise.
OMG, I laughed so loud heads turned (I work in a library so it was pretty noticeable).
My wife won’t eat blue M&Ms, they are “unnatural”.
I so want to hang out with you!
I don’t know this this is weird, but it’s a bit OCD:
When I do one-limb-at-a-time exercises, I always start with the right side.
My lifting partner pointed out that I was wasting time on the kneeling leg curl machine, because I had to re-adjust it to the right, when he had just finished his left leg.
So, now I make a big deal about it if I start on the left…
I mentioned to him that I saw a tank-top shirt that I liked, but the pattern was printed on the inside, to make it look faded, and there’s just no way I could wear that- it would make me crazy.
For my own weirdness:
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I do the paper cup seam against the fingers thing.
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I drink coffee on the week days, only from my orange Fiestaware mug (although we have 20+ mugs in the cabinet). On the weekends it’s one of two cups I got at different vacation spots. Always the same cups on the same days.
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The car key has to go in the ignition with the buttons facing away from my thumb, because I think if I do it the other way I’ll hit the panic button.
I don’t do engine sounds, but do say “Erk!” when I mash the brakes.
Like, “Dear Lord, thank you for this food and please keep my roadside pantry full.”? 
Well, I pray for their surviving families.
I have preferred silverware, too, but I also have evil silverware that can never be used by me personally, although I’ll use it to feed the cats, and people with no silverware aversion are free to use it too.
When I leave the house I always leave the dog in charge. Cats don’t do responsibility.
Ok, so “He puts his pants on two legs at a time, like nobody else.”
When I’m feeding my cats, I make up little songs about whatever I’m feeding them, what animal it came from, and how much they’ll enjoy it. One of them seems to respond, the other just wants the damn food already.
NSA has noted this.
Oh yes, I do this too! I always give the cats a talk as I’m getting ready to leave for work in the morning. “Don’t eat all the food in the first twenty minutes - save some for later in the day. It might rain later today so close the windows if the wind starts blowing, and remember to brush your teeth!” and when I get home they get a listing of my day’s happenings as I also ask them about theirs. “Oh, how nice! Did you play with your fuzzy toy mice today or just chase the jingle balls? Uh-huh - I see some pipe cleaners on the floor, were the two younguns smoking them again?” and so forth… Totally silly things, because I’m easy to amuse. When I have a phone call the cats are often included in the call for those closest to me - and they seem to sense when it’s someone they know and will nose in and meow. Some folks will ask me “What’d he say? Was that a he or was it Anna? Now what’d he say?” and I’ll have to um… translate the meows for them. “Oh, that was one of the boys - they like your blue t-shirt and want you to wear it when you come over tonight.” or whatever. Yes weird.
I also have dedicated spoons for JUST the cat food. All silverware gets washed well and it shouldn’t matter - but those regular-size spoons? Cat food only. I just can’t bring myself to eat from them, even though they’re thoroughly washed after each use. Just… no.
Oh yes and rocks. Yes ROCKS. If we’re out walking on a gravel road or in the country… beach… whatever, and there are little rocks. You’ll soon discover that it’s a slow walk - because just like a little kid, I WILL stop and pick up the pretty rocks as I go along. I usually go home with pockets full of rocks. I like rocks. 
But my rock tumbler died last winter so I gotta get a new one - not that I’ve stopped collecting pretty rocks, mind you…bad habits are hard to kill. 
Just a couple non-pet related ones (don’t have a pet at this time).
If I am getting money from my checking account to start the month, I always take out an amount that leaves me with a round number…for example, if I have $737.54 on 30 June, I will write a check for $237.54 to leave me with an even $500 on 1 July.
Another monetary one; when I pay in cash, I usually put my billfold away, then take it right back out to collect the change…but before I put the change in it, I tap it twice on the counter…not once or several times, always twice.
Short microwave times are always done by pressing a single key: 0:11, 0:22, 0:33, 0:44 (probably my favorite), etc. I justify this as more efficient than having to locate two keys with my finger.
Socks must match - exactly. Who can say what evil might ensure from mismatched socks?
A coffee cup with a thin rim is much to be preferred over the more common fat rim.
Fruit tastes better to me when it’s cut up. Exception: oranges and other segmented citrus fruits taste better when separated into individual segments.
I put my pants on one leg at a time.
-When I adjust the volume on something which displays a numerical value, it has to be set to either an even number or a multiple of five.
-When I’m checking out at a store/coffee shop/etc, I have to straighten up the area while the cashier checks me out. I have to tidy up the piles of business cards or free stickers, re-seat the pen dangling from the PIN pad, and whatever else needs to be put in order.
-At home, all doors leading to outside need to be locked. Door to the garage is never locked. Sometimes they need to be checked several times.
I do this. I usually go with:
“Okay man, I have to go to work. You have to stay here. That’s the way it goes. Be good. See you when I get home.”
“Okay man, one of us needs to go to work. You or me? Me? You’re going to have to go one of these days. This is bullshit.”
“Okay man, you’re in charge. Be sure to bark at the UPS guy. Keep track of the squirrel situation.”
No, no, no… prime numbers. So set your volume at 1, 2, 3, 5, 7 … or turn it up to 11.
Everything should be prime numbers. Especially the ending of something, like going for a run, and ending at 34 minut…no, 35 (dammit that’s 5x7)… 36…ahhh, 37 minutes! Whew!