A guy walks into a store to buy brains. He asks the woman behind the counter how much each of the brains cost. They saleswoman tells him, "$5/gram for women's brains, $20/gram for dog's brains, and $100/gram for men's brains."
So the guy is surprised with the varying prices, and he asks the saleswoman, "How come men's brain's are so much more expensive than women's brains or dog's brains?"
And the saleswoman replies, "Are you kidding!?!?!?!? Do you know how many men it takes to get a gram of brains????"