Father and son in supermarket.
"Dad. what are these?"
"That's a 3 pack of condoms son for secondary school lads.
1 for friday night, 1 for saturday night and 1 for sunday night"
"What about the 6 pack dad?"
"Those are for university lads.
2 for friday night, 2 for saturday night and 2 for sunday night."
"Well dad. What about the 12 pack then?"
"Married men son. . . . 1 for january, 1 for february, 1 for march . . .