The actor enjoys playing tricks on the stars of the TV musical, and he's especially proud of a stunt involving Monteith's beloved car.
He tells Britain's Cosmopolitan magazine, "I'm usually the one pranking people. I got Cory good. He had this really amazing sports car and I found this sticker that makes it look like it's been badly scratched. Lea was parked beside him so we put a little bit of tape on her bumper (too) to make it look like she was the one who did the damage.
"Lea was so p**sed off she threw her sandwich at me! But she soon started laughing about it."