Two of my favorite "oops" moments in movies/videos are the
Sting video for "Desert Rose", where
Sting sings into the wrong side of an AKG C-414 (hey, the gold side looks better on video, and he's lip-synching to the
track, so why not?), and one of the ball scenes in
What a Girl Wants, where the guy (can't remember his name, LOL) is singing into a "wireless" mic. Seems that they originally had a wired mic, but that didn't work for the look they wanted, so in an attempt to make it look like an antenna, they cut the cable about an inch past the
XLR body coming out of the mic.