What have you ever done with a brick?

Asking this strange question for a brainstorming session. A brick, you ask? Yes, a brick. A red, heavy, ordinary brick. Besides the obvious (ie: build a wall) what have you ever used a brick for? Have you recently done anything useful/strange/crazy with one? What would you do if I said I would give you $100 to “do something with this brick?” What uses can you come up with for an ordinary brick? Silly/funny/odd suggestions welcomed! All suggestions much appreciated! PS: If you’re gonna say “Throw it at someone/something” please explain WHY you would.