Um hey, put your iPad away, please!

So I was at the Mythbusters live Behind the Myths tour tonight. There were two people in the front rows with full-size iPads ... just watching videos, generally using their ipad, holding it up like assholes.

Adam Savage actually called them out and said "Hey iPad people, you know if you put those things down you can watch the show, right?"

Why do people do this? And before you guys get upset note I don't think this is solely an iPad/Apple thing -- but a tablet thing in general. Put your giant 10-inch tablet away and have some respect for the people around you, yeah?