I am reminded of a thread from a few months ago where people were arguing that, at the urinal, you are supposed to unbuckle your belt, unzip and unbutton your pants, and then pull it all, pants and underwear, down past your balls to take a piss. Because the zipper teeth will... cut? They will cut your penis. Even though there are flaps of fabric between the zipper teeth and your wiener.
The weirdest thing is that a lot of people were agreeing with this and laughing at people who used the "underwear hole." They were saying that the only reason the zipper exists is to make it easier to put your pants on. Also they were saying that their dicks are too big to fit through the hole and zipper anyway.
I found this thread by following the post history of that guy who was talking about killing himself a few days ago. The thread where TUSR's post got deleted.