It has been a long time since I have read it, but I remember a passage from Dr. Oliver Sacks book The Man Who Mistook His Wife For A Hat where the good doctor was observing some of his patients as they watched the T.V.

President Ronald Regan was giving a speech somewhere, and the patients were rolling around on the floor in hysterics at the sight of him.

Apparently his body language was different from what his eyes 'said', and this was the reason for their uncontrolled mirth.

Must admit, I got that impression off him a few times as well. Didn't find it particularly funny, though.

But most other preformance artists, I can take.

B.