Looking for a place to hide a spare set of keys outside your house, but don't want to just hide them under a rock? Here's a clever solution: hide them in a fake sprinkler head.
It's essentially a little plastic film-canister-like thing, a plastic tube with a screw top. Simply place your spare keys in there and bury it in your garden with the top sticking out. It'll look like the top to a buried sprinkler to everyone who walks by, but you, you my friend will know the secret. And that's what hiding keys are all about.