I stumbled upon Yes Men today. Had heard of their movie before, but never actually seen it. Definitely have to do that now.
This is friendly trouble-making at its best. Oh well, maybe not always friendly, but they do poke around in the business world in a magnificent way.
Here is a clip with one of the Yes Men explaining their work.
Half of me wishes I'd done this. The other half knows I'd never have dared.