Heard this one when i was 14..
Two cockroaches fall down in an unflushed toilet bowl. There they find themselves in what they called ‘heaven on earth’ with plenty of food to go around for weeks.
The start devouring the $hit in the toilet bowl. Two hours later one of them gets tired and says
“I’m full!!! I need to go $hit”
to which the other cockroach says
“Dude learn some manners!! Atleast dont talk about that stuff at the dinner table!”