My pal Tia emailed me this link, which is, by far and away, the funniest Photoshop tutorial I have ever watched.
The language is very NSFW, but by God, it is so damn funny that you almost just don't care. If you have about 20 minutes to spare, definitely watch 1-4. 5 is funny, but the first 4 are definitely the funniest.
And, by the way, you totally suck at Photoshop.