For some reason this email forward struck me as especially funny today:
Who is your real friend?
This really works...!
If you don't believe it, just try this experiment.
Put your dog and your spouse in the trunk of the car for an hour.
When you open the trunk, who is really happy to see you??
Legal disclaimer: Of course I do not actually endorse putting your spouse, dog, cat, iguana, pig, turtle, or any other living creature in the truck of your car... but hey, I'll bet you laughed at this one, didn't you? :)