I have only managed to see one of them so far, but it must be an illusion, I could see that a mobile phone might be up his sleeve, and I think there is some kind of moveable piece in the table underneath, where he can make the pic of the mobile disappear to. Thats the logical explanation...
(IMG:
style_emoticons/default/cc_confused.gif) but not sure really...
It does look clever though (IMG:
style_emoticons/default/bounce.gif)