WD-40 is designed to make your doors less squeaky, but specially for Halloween, the brand has turned that on its head with an app that makes them groan like those of a spooky haunted house.
To use the Haunted Door App, select your favourite creepy door creak, place your phone in a bag and hang it on your inside doorknob. When trick-or-treaters come by, it'll make a suitably spooky noise as you open the door. (Unless you're watching Netflix, that is.)
The app was created by Toronto agency BIMM, to promote the idea that "for every other night, there's WD-40."