It's wrong to pop someone else's tire.
Brent and his wife, Mel, are exiting the mall, when Brent notices that the car next to theirs has blocked them in, making it impossible to reach their car.
Brent wants to react to being blocked from his car.
Brent decides to call mall security, so they can get the car towed out of his way.
Brent decides to teach the driver a lesson and uses his key chain knife to poke a hole in the guy's tires.
Mel is happy that Brent was resourceful enough to find a way to get them out of the situation.
Mel is disgusted that Brent is reacting like a child and can't control his temper.