The Defendius door chain (Art Lebedev Studio) is a clever design exercise, but I’m betting this maze lock won’t turn up on the front door of too many homes — and it probably wouldn’t be endorsed by too many firefighters, or insurance types, or anyone else who thinks that getting out of your home quickly might be a good thing…

Still, isn’t it just the most engaging piece of home hardware you’ve seen in ages?

So I’m thinking, why not use a maze chain to lock a cupboard door, and put the car keys there when you throw your next party. And if your cousin Johnny is one brew past figuring out the puzzle in, oh, 30 seconds — too bad, guess he can’t drive home!