Father and Son in Pharmacy

is for college boys. One for Friday, one for Saturday and one for Sunday.”
“I see, what about the 6-pack?”
“That one is for young bachelors. Twice on a Friday, twice on a Saturday, and twice on a Sunday.”
The boy’s eyes widened as he asked, “And what about the 12-pack?”
“The 12-pack is for married men. One for January, one for February, one for March…..”