Rolf sings Moskau

When a boomerang hit Rolf's butt, it made him sing Moskau from Dschinghis Khan.
Meanwhile, the Eds were selling hygiene products for Rolf, but, when he opened the door, he continued singing this song, until Eddy closed it to stop this infernal song. Then Eddy decides to find a house and Double D opened the door and Rolf thanked him.

I don't own this cartoon,
It belongs to Cartoon Network.