Too Obscure For You?

I know this isn’t a Penny Arcade news post, but surely you can decipher the prime/composite number joke. At least a little?

Veterans of, oh, any game in existence know the abstract method by which a player heals himself. Potions, herbs, painkillers, and anything else that might heal a wound can be taken orally (or, given how most characters pick up items, through the foot) to cure any number of problems. It never ceases to amaze me.