During an American broadcasting of the serial The Horror of Fang Rock, a man in a Max Headroom mask hijacked the broadcast signal and spoke mostly gibberish, but what could be understood... was not very nice. At the end his pants fell down and he got spanked.

Because I have not seen the whole thing, I'm not linking to it in case the final moment is worksafe.

EDIT: Confirmed, bare butt. Bare butt seen from the side, but I'm not taking chances.