never got my dick stuck in the zipper but that sounds more painful imo
I remember I was in middle school and tried to rush...got it stuck in there while zippering up--the pain was horrific, because the skin was stuck in the zipper---so you had to un-zipper it, thus causing the pain all over again...
Yes, bike saddle is a bad "ball" pain, so is the "tickling the girlfriend who accidently you sack like a horse kicking a dog", thus ending the evening and any "special event" that night...
It's called "black and blue balls"....