I don’t use my garage very often, but I am a pretty forgetful person. So it’s not uncommon for me to leave my garage door open all night, revealing its precious contents to passers-by. Thankfully I haven’t been burgled yet. And now, thanks to a new Instructable, I can make my own “Hey dummy, you left your garage door open” reminder system!

How to install a “garage door open” indicator is a pretty clever idea. An open switch activates a small but annoying light in the master bedroom. If the garage door is open, you’ll see it when you lie in bed. It’s unobtrusive, but extremely functional!