the ambulance beavers are a running gag. they are two beavers who appear when a character is seriously injured. however, instead of taking the character who is hurt off on a stretcher, they take the inanimate object the character was injured on. an example is when rocko crashes his bumper car at the carnival, the ambulance beavers take away the car instead of rocko. when rocko's appendix was hurting him, he fell off his jackhammer and they took the jackhammer instead of rocko. in the same episode, they took heffer, after they were told to (and they actually got it right), for emergency hippo-suction (liposuction) after he rushed to the hospital with rocko in tow. their catchphrase is saying "hup!" repeatedly, while carrying a stretcher, loading the object on, and driving off to the hospital. they are voiced by tom kenny.