The garage door might spontaneously go up, and then robbers would be able to steal my dog.
If I left the iron on, it might burn the house down.
If the pilot light on the stove goes out, we could all die from a lack of oxygen.
If I have a spelling error in this document, everyone will think that I am incompetent.
Sit in the driveway for 5 minutes after the door closes to make sure that it will not go up on its own.
Going back to the laundry room over 10 times just to be sure that the iron is unplugged and not on.
Getting up numerous times over the course of the night to be sure that the pilot light has not blown out.
Running the spell check numerous times before printing out the document, reading the printout numerous times to be sure there are no errors, and, even after handing it in, asking for it back to just check it a few more times to be sure that it is error-free.