IIRC that was during Fatboy Slim’s segment during the closing ceremony, I believe it was around the time the huge octopus was brought on the stage. I don’t have the video anymore so I can’t tell you the exact moment.
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(disclaimer: I am in no way linked to Wiggle. No money is made, there is no other insensitive besides the fact that I just thought that it would be nice to spread the word around, etc.)