When you leave your car off for repairs

Ok, this is kind of a gripe.  When you leave your car at a shop for repair, make sure there's some freakin' gas in it!  We can't drive it if there's no gas in it.  You're not gonna pay me to walk home from a test drive and will be irritated when I charge you for putting gas in your car.  USE YOUR BRAIN!  First of all, you shouldn't run your tank below 1/4 tank.  Modern, in the tank fuel pumps rely on sufficient gas to cool them and to keep them from sucking up the crap at the bottom.  Secondly, don't be a dumbass.  How can I drive your car sufficiently to diagnose something if there's no gas in the tank.