Okay, this is going to sound goofy, but when giving a house warming gift, especially to new home owners, I always include an emergency water and gas shut off wrench (usually wrapped in a bow and attached to the actual gift).
Odd, I know, but it is something almost no one owns, but almost everyone needs at some point, usually in an emergency-type situation. I learned this the hard way one Sunday afternoon when I had a pipe leak under my kitchen sink and had to lay there for over an hour trying to hold back the leak with my hand, like the little Dutch boy with his finger in the dike, while my wife ran around town looking for the right tool to turn off the water main.
