The episode "London Town Treachery" had Dum-Dum in a hot air balloon with a pair of binoculars searching for Penelope. But the binoculars are still in their case. Clyde tells him, "It would work better if you took the binoculars out!" Dum-Dum does just that—only he's now looking into an empty case.
Dum-Dum: It still doesn't work, Clyde!
Penelope calling the Anthill Mob to ask for help. The one who answers the phone says, "You don't say!" several times. Then he hangs up and Clyde asks him where Penelope is.