I’ve got an array of them, but here are the standouts:
–a little pink glow in the dark alien in a silver flying saucer (cute)
–a little Classic Trek tricorder that chirps loudly when opened (cute and funny)
–a very heavy, thick gold Deep Space Nine Latinum keychain (cool)
–a plastic squeaky ducky (cute)
–a plastic Home Grocer truck with a thin tape measure in it (cool)
Add adjectives as desired.
An oozing baby keychain. When you squeeze it, slimy brown stuff comes out it’s back end; when you release it, it oozes back in.
It was a gift.
A stuffed lizard’s foot - from a big Indonesian lizard. About 2 inches long.
Mostly chains with funny sayings…
“Today has been cancelled due to lack of excitement”
“I only LOOK sweet and innocent”
I also have a pair of mini-handcuffs on my chain… the rest I can’t think of right now being stored in some box that I have yet to unpack.
My keychain is pocket-knife like thingy that actually holds lock picks and a tension wrench. Of course, this is totally useless because if I have my keychain I probably have my keys. But I like it.
Back in 1988, I changed my last name. For the briefest of moments, I wondered if I had made a mistake. At the time I worked at a grovery store. One day while rummaging through the drawer under the cash register stand, I found a large charm that someone had lost a long time before - the letter ‘H’ - same letter that started my new last name. There went the doubt.
I used to have a Tintin figurine which was so cool but he dropped off one day.
I have a little mini N64 controller that everyone stops and asks me about.
I have a little Coke can with what sounds like cola in it.
And the keyring for my spare set of key for my car is and old Hulk Hogan figurine ripping off his shirt. Its so kitsch, I love it.
I used to have one that showed a little man (think stick figure with fat lines) on his knees, his arm around his belling, puking. It had the red circle with the slash to indicate no puking. I hung it in my car and flashed it at every drunk friend who got in the car. Nobody ever had an “accident” until the one night I decided to let another friend drive my ex around to the bars without me. I might have thrown it away after that. Lost its good karma and everything.
I have a keychain that’s a replica of Bumblebee from the original Transformers series…I don’t actualy use it, though, as it’s a bit much for a pocket to hold along with my car remotes and micra…
I’ve got one at the moment that reads:
“Knock My Socks Off, Then Rub My Feet”
<< have made this letter longer than usual because I lack the time to make it shorter. – Blaise Pascal >>
I have very cool Marvin the Martian[sup]TM[/sup] keychain. Unfortunately I don’t actually keep it on my keyring anymore, as the paint is starting to get chipped off of the plastic.
A friend of mine has a cool keychain that says “There’s a thin person inside of me screaming to get out, but I keep her sedated with chocolate.” I think she made it herself (she’s graphic artist).
I’ve had the same keychain since I started driving - 26 years ago. Its just a piece of 3/4" copper pipe. Cut to be about the size of a man’s wedding ring. That piece of copper has been in my left front pants pocket every day for 26 years. Jeeeezzz.
I have one keychain that I got from some program or another. It’s really cheap and not a very good keychain, so I don’t use it. But it has a little button you can push so a little plastic bit pops out for you to hook on a belt loop. If you take out the metal ring you put keys on and push the button, you can shoot the plastic bit several feet. Quite amusing.
I carry a keychain schaped like a phaser from Star Trek the Next Generation. It used to make a shooting noise and blink a red light but it’s out of bateries right now. Before that I had a tricorder but on of the hinges broke.
My sister gave me mine ~20 years ago. She got it at a market in San Francisco. It’s a brass job with the screw-on end.
As far as I can tell, it’s supposed to be a sperm cell. A flat round head with two holes that look like eyes, a zig-zag tail (that the keys go on) and the little screw-on thing on the end.
I’m sure my sister never snapped to its representation.
I have a keychain that is my name carved in wood. I’ve had it for 17 1/2 years–it was the first gift that the man who would become my husband ever bought me–it has lasted through seventeen years of marriage and three children and is very special to me.
I also have a Dallas Cowboys keyring that is a bottle opener. I can watch the game and drink sodas (I don’t like beer) and support my team all at the same time! 
Mine is a large (about 4" long) jailers key.
Keys held by a split ring.
It weighs a ton, but it helps me keep rack of where the keys are.
A small Swiss Army knife
A Tigger penlight (my third one–have had Mickey and Cinderella in the past)
A cat eyeball
A little leather whip
A plastic 4 leaf clover
I have a few, depending on the the kays are for (storage unit, pool, office, home [not in that order]):
a small medieval herald, complete with (plastic) feathered cap, tabard, stiped leggings and herald’s trumpet.
“That’s it! I’m calling the mothership.”
ceramic zebra, except the head broke off, so I colored the stump and the body with a red magic marker.
a Mini-MagLight
I have a key.
It is an antique (1800’s?) key I bought for a buck at a Charleston Flea Market. I used to call it my skeleton key for chastity belts.