fired up
But did you know my boss is dating the head of HR? What! That's so against company policy! Now I'm getting me all fired up. I think you should complain to the CEO.
Phrase
use the same methods as someone else to them
fight fire with fire
Still, she was so not nice. She let me go with no good cause. I'm going to fight fire with fire. Maybe I'll just get her and her boyfriend fired too!