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Horrible Horn is a gross car horn. He has a swirl on his horn bell, along with slime on it. He wears a thick pair of goggles and has a small handlebar mustache. He has an opened-mouth grin with his tongue sticking out, revealing buck teeth.
- Horrible Horn is exclusive to both the 2 in 1 Rotbot Assault Vehicle and the 2 in 1 Gross Glow Assault Vehicle, along with Scummy Onion-Bot.