We've had escargot quite a few times, my first was with a girlfriend who ordered it and suggest I swallow it like a raw oyster. Heck with that, I shook off the butter/garlic and savored it.
Have had huitlacoche (aka: corn smut/corn mold/Mexican truffle) crepes with a green Pablano cream sauce in Acapulco a few times, delicious. The recipe usually is made with squash blossoms and a pinch of epazote leaves.
Also had baby eels on crackers there, so-so, more novelty.
Don't like beef tripe, never had brain but have tried tongue. One thing I'll never try are Rocky Mountain oysters.
Venison's good, elk steak is absolutely delicious. Bear would probably be too gamey.
Chicken (or turkey) gizzards, so-so, but do like to fry the heart in butter.
Any shellfish, anytime. Our community restaurant also makes a great fried calamari (squid) served with a hot, red chili sauce.
Tried octopus somewhere once at a restaurant.
Another girlfriend ordered a whole Maine lobster at a beachside restaurant and also extracted some green stuff. I tasted it, didn't like it.
Used to pick fiddleheads (baby ferns) in the Sierras, goes great with fresh-caught brook trout. Also have carved off willow bark to chew on for, uh... mountain-morning hangovers. Works as good as aspirin.
Have had cactus, not much flavor.
In '65 halfway down the Florida keys I had breaded/fried sea turtle steak (no doubt illegal today) at a small Cuban place that was heaven, with yellow saffron rice and key lime pie. They had the huge turtles swimming around in a pen out back.
Love sushi, and particularly those with Tobiko (little orange flying fish roe). Once had some with a raw quail egg, more for novelty/show off for a date.
Used to love the Tiny Tots sardines in olive oil on saltine crackers. Almost bought some yesterday at the store. Next time will for nostalgia & see if they're just as good as remembered.
Anchovies on a pizza? Forget it!
Anyone eat the little grub worm from a bottle of Mescal? Between Rosarita and Ensenada is a place called La Fonda's where the owners son invited us to their back office. He pulled out a 5 gallon glass jug of Indian-made blue agave tequila that had a full-grown Diamondback rattlesnake at the bottom. Smooth as silk and tasty, even with the snake scales floating in the shooters.
He then pulled out a gallon jug of tequila with plant life inside (probably peyote buttons, jimson weed, datura root)... who knows? I took a sip and my wife had a shooter. She got a major buzz.
So there you have it, at least what I remember.