The end of "Brother's Day." Winslow tried to set up a "Gift of the Magi" Plot, with Cat selling his luffa sponge to buy Dog a mud-wrestling costume and Dog selling the mud from his ring. However, instead of the luffa carrying case, Dog bought Cat a mud-wrestling costume, too. After Winslow expresses disappointment over this turn of events, Cat and Dog don their costumes and tag-team him as payback.
Dog: Looks like it's curtains for the little blue guy!