This website isn't the only thing I learned about at a conference recently, but it's the only thing I learned that actually made me laugh out loud. Repeatedly.
The keynote presenter used a few of these slides in her PowerPoint, just to break the ice. It worked. We immediately knew that she was not only a genius, but also a fun person with a delightful sense of humor.
Many more of these are available at http://www.despair.com/. These are just a few of my favorites.
By the way, they also sell t-shirts and "glassware for pessimists" on the site. Go ahead. Look around.