http://www.youtube.com/watch?v=g_AtNY0bYAA
13-year old Jack Black shills the Atari game, Pitfall!, while wearing a safari hat! Is there really anything else that needs to be said?
As a special bonus, here’s an old Atari commercial featuring Phil Hartman. I don’t know how famous he was at the time he made this, so I’m not sure if it qualifies as a “Before They Were Stars”, but seeing Phil get WAY too excited about Atari Ice Hockey is pretty priceless.