Tampons

Guy goes to the pharmacy at his wife's request to buy her some tampons. About an hour later he comes home with a bag of cotton balls.

Staring at him in disbelief she asks, "What the HELL...?!?! I asked for TAMPONS, not friggin COTTONBALLS!!"

He says, "Remember when I asked you to pick me up a pack of cigarettes and you came home with a tin of tobacco and told me to roll my own because the cigs were too expensive.....?"