How do you annoy a girl that's annoying you?

Unless you are a girl who is very, very confident and sure of what she's always doing, never annoy a girl who is higher up on the social food chain than you are. Unless she is pretty powerless without her friends, she can make your life go like hell, trust me. If you are more popular than her, then some ways are tripping her in the cafeteria, spilling juice/punch on her brand-new shirt "by accident", stealing her boyfriend, etc. This might not just cause her to be annoyed, though, it might cause her to begin as your enemy.

Another answer:

My advice is just to ignore her. If her purpose is to annoy you, she should be expecting some sort of retaliation. Don't give it to her.

You should steal her boyfriend, throw erasers at her in class. I like the spill juice on her shirt idea. But yes i agree with the first answer, if shes more popular steer clear!