Funny comedian on Letterman or Leno or O'Brien... goes to B Pro Shop and shops buts acts stupid kind of?

Please help me. I am trying to find the name of this comedian guy who is on the David Letterman show who went to B Pro Shops and acted funny (I forgot the details). I think he acted like he knew nothing about shopping and made funny contradictions to the worker who was foreign which made it even funnier I think. Please help me find this guys name or a youtube video of him. Please Best answer/10 points if you know (duh). Not that jump into the water and swim with the fish stuff. Even though that was kinda cool.