"The Mission is Over"

"Aloha Hoek" ends with Stimpy mourning his seemingly-deceased friend Ren, until his wristwatch suddenly buzzes. He drops Ren, and then they suddenly appear bulgy with visible zippers, mask lines on their necks, and empty eye sockets. A Dramatic Unmask follows, revealing they are actually Soviet communist spies vaguely resembling "Russian" caricatures of Fred Flintstone and Barney Rubble.

Example of:
Gainax Ending