The office prank of photocopying ones butt is as classic as slipping on a banana peel. So, is is quite fitting that a special chair has been made to photocopy the fanny.

The iBum uses motion sensors to identify when a prank must commence. When your unsuspecting friend sits down, the iBum kicks into action and gives you a nice picture of their derriere.

The upside to this prank for all of your victims is that it leaves there bottom with that fresh warm photocopied feeling! Oh, make sure to start a scrapbook - it'll great for parties.