There's a lot of interesting things to be found just browsing the game data. Check out the Missing Content
page of GFN if you haven't ever done that. I supplied at least some of the audio files (although I should probably say that since then I've found that the 'custard' clip can
be heard in-game by showing Eva Domino's mouthpiece after you've used it with the auto-body filler but before you have Manny bite it). Of course, there is I think more than one clip on YouTube now with the 'missing' factory island dialog that some lucky stiffs have managed to somehow get in game.
I once used clips of Sam & Max Hit the Road for my answering machine. Sometimes wrong numbers would call back just to hear it again. Scumm Revisted is a great way to waste time.