My Irish grandfather used to tell us limericks that were on the verge of being dirty, but not quite. It made us giggle and there was nothing our parents could do about it. Here's one of my favorites:
There once was a man from cunt fuck
Whose hair was so long he could suck slut cock twat
He said with a grin, as he fuck shit piss diarrhea vomit shit fuck,
"If my fuck was a cock-suck shit fuck I would cunt cunt cunt shit whore"