Someone mentioned Vin Garbutt up there, here's a story about his foot-tapping.
He was the FF guest, standing on the edge of the improvised stage, and in his first number the tremors conducted up the mic' stand. As he went into his preamble for the next number, he slipped off his (slip-on) shoes, but the soundman didn't notice, and hurried around and took down the mic' stand and erected it to its full length and put it onto the ground in front of the stage, but unfortunately it was then about 3' too low. Vin never stopped talking while this was going on, moving to use the mic' and ended up kneeling on the stage. Then the man lowered the stand to normal height and put it back on the stage. Vin followed it down and up again, commenting that that was "much better." Away went the man looking for something to insulate the stand from the stage, and came back with an enormous roll of canvas, to which Vin apologised that he "couldn't eat another thing!"
This lot took about 10mins to enact, Vin never stopped talking about his next number except to make the comments mentioned. It was a piece of wit and craftsmanship that I'll never forget.