Garage parking tool

I've seen advertised on TV these laser parking assistants. The laser beam points a red dot to show you exactly how far to pull your car up so that you don't crunch your front fender or have your back bumper crushed by the garage door.

A much cheaper solution is to hang an old tennis ball on a string from the rafters so it just touches the wind shield as it hangs straight down. The point at which the ball touches the windshield is the point at which you stop the car when you drive in. You'll need to park the car where you want it, then throw the ball connected to a longer piece of string. While holding the other end of the string, pull it until the ball touches the glass. Then tie the string on itself. You've just saved $20 to $35.