On a related note, have any of you guys ever seen/heard/participated in tray surfing?

At a previous airline job, one of the CA's told me a story about how he jumped on a UA non-rev/ferry flight where he happened to be pals with the cockpit crew. Supposedly, on take-off, he and another j/s'er attempted to see how far down the aisle they could surf on a galley service tray.