security

door lock lock security slide lock - 6200219136
By Unknown
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I think I got stupider just from looking at this.

locked up Professional At Work security - 5126783232
By Unknown
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They were so close to stealing the whole extension cord.

~NSHA

dual use holding it up rake security - 5630183424
By M
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From the submitter:

It's actually a clever theft deterrent - it shows thieves you have nothing worth stealing.

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Steve Hoefer at Grathio labs shows off his Arduino based door opener, which responds to knocks on the door bye timing the gaps between the sounds. If the gap matches the programmed knock, it unlocks. Let's never use keys again!

Know a little bit about Arduino and care to make your own? Check out his Instructables post!