A boy goes to the
drug store with his dad and sees the condom display.
B: "Dad, why do they do packs of one condom?"
D: "Those are for the high-schoolers for Friday nights."
B: "So, why do they make packs of three?"
D: "For the college guys for Friday, Saturday and Sunday nights."
B: "Then why do they make packs of 12?"
D: "Those are for married couples -- you know, January, February, March."