Here's my entry:
A young boy aged 7 and his father are shopping in the supermarket, and the dad takes his son over to the chemist section to get some Nurafen. Anyway, the kid spies the condom display and goes "Daddy, what are those up there?"
The dad thinks he may as well get in early with the facts of life and replies "Those are condoms. They stop ladies getting pregnant."
"Oh yes," says the boy. "We learned about those in health class at school. Who would buy these?" he said, gesturing to a 3-pack of condoms.
"High school students," the dad replies. "One for Friday, one for Saturday, one for Sunday."
"What about this one?" asks the boy, picking up a 6-pack of condoms.
"University students" mutters the dad. "Two for Friday, two for Saturday, two for Sunday."
"And who on earth would buy these?" says the boy. "There's twelve condoms in this packet!!"
"Ah," replies the dad. "Those are for married men. One for January, one for February..."

Tbh I don't care if you think that's gash.