I'm going to drive around this guy at starbucks
That sounds like a dangerous idea. Why do you want to drive around him?
I want to play a prank on him and scare him out of his mind.
Playing a prank on someone when in vehicles is downright dangerous. If he swerves his car or you swerve yours, you can hurt or even kill someone.
It's not like someone is going to die. Maybe I should give in reverse.
I sure hope no one dies but someone could  certainly get seriously hurt. This could get you in a lot of trouble so it is best to be careful and follow the rules of the road.