Giving of yourself is a great way to break a funk. Of course, if that opportunity isn't immediately available, reading about other peoples' shit experiences can do the trick.
Today, after making a complete ass of myself to a girl I like, reading about estate law, and failing to get any work done on my overdue project, this F**k My Life post saved the day:
"Today, my boss fired me via text message. I don't have a text messaging plan. I paid $0.25 to get fired. FML."
Thanks to Alexis for the link.