Continuity mistake: When Dr. Scratchansniff shuts himself in the bathroom to see the Warners goofing off in the tub, his right hand moves away from the doorknob between shots.
Continuity mistake: During the scene where Wakko flushes Dr. Scratchansniff down the toilet, the bathroom doorknob changes sides.
Answer: According to the Animaniacs Wikia: "Baloney is one of the few people capable of truly terrifying Yakko, Wakko and Dot, largely due to being impervious to their violently physical brand of humour and his inability to understand how much they despise him."
lionhead