student: my friend invested all of his savings into condoms right when there was the big aids scare. but then condoms just dropped, and he lost all of his money!
gsI: ah. so you see how unpredictable investing can be... did your friend stick with condoms, until it went back up?
student: oh, no he pulled out... of condoms.
*the whole class laughs*
gsi: *laughs then mutters* oh that's gross.