...take a look (if you haven't seen it already) at this classic clip of the angriest man in the universe trying to film a commercial for the "Mini Winnie" Winnebago vehicle. (here's a screen cap and the link--I don't know how to embed videos)
I first saw the entire video (not just the hilarious strings of cussing but more of his actual lines mixed in with his flubs and colorful language) way back in 2000 or so, and it was always one of my favorite things. For some reason, I thought of it today and I found this edited version on the yootoobs.
So whenever you're having a bad day, one of those days when you feel like you can't do anything right -- just watch this guy, Jack Rebney, and remember that at least you're not him.
P.S. I myself am having a bad day. Long story, but I suppose at least it's not work-related.