The son asks, "Dad, what's the three pack for?"

Father replies, "That's for when you're in high school: two for Friday night - one for Saturday night."

The son asks, "What's the six pack for?"

Father replies, "That's for when you're in college: two for Friday night - two for Saturday night - two for Sunday morning."

Then the son asks, "What's the 12 pack for?"

"That's for when you're married , one for January, one for February, one for March..."