Brains For Sale

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????