Oh, in case you're wondering what the worst move ever in a chess match shown in a film/on tv/etc, I give the award to the music video for sour times by portishead:
at 38 seconds, the position is this:
The bassist from Portishead (playing black) is to move. He is a clear rook up and has decent attacking chances. Many of you will note that Ng3+ wins the queen and kills off the game. Rg7 is also very playable.
Instead, watch the video. He plays an absolute howler in Qg1+??
And yes, I noticed this first time, for the 3 seconds it's on the screen