Gnats vs Orioles

 

In my general area, there are two baseball teams - the Nationals (called the Nats) and the Orioles (called the O's). That's all I have to say because I don't follow baseball and can't think of any more baseball things.

Explanation: Gnats sounds like Nats, and the Nats are a team that play the Orioles.

Text:
M: The gnats are attacking me!
L: It's because you're wearing an Oriole's hat.