Coworker One: The vending machine is giving out Susan B. Anthony coins.

Coworker two: Mm?

Coworker One: Yeah. I put in a five, and got four of these back as change. It usually gives you those Sacagawea coins--I've never seen it give Susan B's before.

Coworker two: I've never seen a Susan B. Anthony coin in my life.

Coworker One: Really? Here, take a look.

Coworker two: Thanks.

Coworker One: You can go ahead and keep it, if you want.

Coworker two: Okay, cool.

{Long pause}

Coworker One: Hey, wait a minute: I just gave you a dollar.