<restrains from posting 1000 youtube links in a row>
I love stand-up as well. Funny thing is I even enjoy watching bad stand-up. Not because it's funny, but I like seeing whats out there, trying to analyze why they aren't funny, what 'category' they fall into, or how they could have made the joke better.
I was a big fan of the late Mitch Hedberg, and after his death really got into Demetri Martin. There are much longer clips, but here is probably my favorite joke of Demetri's
http://www.youtube.com/watch?v=7ORJ_P9waao