For those interested in the Publius Enigma puzzle/hoax (if you don't know what it was, Google it), here's a clip from the pay per view concert that was aired just a few days after the Division Bell tour ended. Right at the beginning of Another Brick in the Wall the word "ENiGMA" was clearly displayed on the background screen, then scribbled out. When the Pulse video of this tour was released, the text that appeared there was "E=MC2".

Apologies for the white bars on the left and right edge of the screen I'm not sure if those are from the original broadcast, or if my nearly 30 year old (and often watched) VHS tape just got a little too worn out.