(if our bodies had such a thing, what life event did you accidentally or voluntarily do that would qualify?) It could be funny, meaningful or serious!
abso-fucking-lutely every bet I took in high school
"Bet you can't stay up for 7 days straight."
"Bet you can't drink this entire 2-liter of Mountain Dew in under 60 seconds."
"Bet you can't do a backflip on the DDR machine."
etc.