I can’t really remember all of them of the top of my head, but:
I ate an entire bag of cat treats for a $2 bill. Not too bad; they taste like incredibly bland potato chips with mild “meat” flavor.
A friend of mine drank bong water on a dare at a house party, threw up, and then drank some of his own vomit for a $45.
Made out with a gay dude, my girlfriend, and a straight male friend to settle a bet on who was the better kisser, and wound up getting the worst case of the flu I have ever contracted.
I tried to run on a treadmill at a house party on a dare, wound up patching some drywall, waking up wearing some other guy’s clothes (I am also a straight male,) and was chased around the house by a dog holding a small plastic katana in its mouth, convinced it was trying to kill me.