No matter how bad your day is you can be sure that somebody out there has it even worse. In fact, I just looked at a website that had twenty-five people having VERY bad days--from the sunbathing girl who got peed on by a large dog to the man running from a huge hippo--that are having a worse day than I am.
Now I have a mental image to help me through those bad days. Whatever's going wrong at work with me is still better than dropping the car you're supposed to fix off the car lift. A sore knee (my chronic complaint) is nothing compared to falling off a speeding skateboard and landing on your face. And that knock in my car engine is better than having my car door handle break off in my hand.
See? It's all a matter of perspective.