Leo and Rocky are two ancient robots that worked at the Frobozz Magic Crematorium in the Cavern of Doom.
Leo might welcome visitors to the Crematorium, shutting and locking the door behind them and they drag the bodies to the Incinerator. Leo shuts the door and Rocky operates the buttons humming with contentment; the last time it was Leo who took out the bones.
The two robots hadn't operated for 142 years: Leo became rusty and gives off occasional sparks and puffs of smoke; Rocky is a floating robot and also seems old and damaged. By that time they had almost forgotten how to operate the machinery and also what a corpse is like; they might mistake for a "customer" any visitor.