Man, people are stupid. Here's a tip: don't steal phones. But if you're going to steal phones, maybe make sure the person you're stealing from isn't an MMA fighter.

A thief approached mixed-martial artist Polyana Viana on a street in Brazil, pretended to draw a weapon, and told her to hand over her phone. Viana thought the weapon looked "too soft" to be real, so she did what anybody would do in that situation: beat the guy senseless.

According to Viana, she threw two punches and a kick before locking him in a choke hold and waiting for police to arrive. The gun turned out to just be a piece of cardboard.

Hopefully this dude thinks twice in the future before pulling a bonehead move like this.