Trying to find Joker scene...

Hey guys.

I saw a clip of this show on YouTube that showed the Joker driving with Batman. He keeps pressing buttons and whatnot and Batman warns him not not to press a particular button, he presses it and he gets knocked out with gas.

Now, I have all of the current DVD sets, and hope to get the new season 3 set this weekend, and I don't recall seeing this scene in any episode? Can anyone tell me where this is?