Maybe it was in the live of Mystman 12 (creator of Baldi) beating Baldi for the first time, where he imitated several characters and even imitated Joe, a character from an old pinball game of his who has a bus and Joe is the owner of a bus
Guess what, if you see an Angry Dr. Reflex heading towards you, and It’s a Bully is Between Him & You, well then, Let Dr. Reflex come for you, because It’s a Bully will get Smashed by Dr. Reflexes Hammer.