The riff: Spoken in a nagging tone by Servo as a gang of kids jumps out of their car. Earlier in the short they exited the same way to menace a middle-aged man whose car was blocking their path.
The explanation: The guy they threatened earlier in the short looks exactly like Gordon Jump, the American actor best known for playing station manager Arthur “Big Guy” Carlson on “WKRP in Cincinnati.” The resemblance was so close I had to look up the short’s cast to make sure it wasn’t him. Jump was also widely recognized as the character of the “Maytag Repairman” from 1989-2003.
Novelty factor: I’ve never really watched WKRP (despite much urging), so I didn’t know of Jump off-hand. I do remember the Maytag ads, though.