locked up

door knob dual use locked up scissors
By Unknown
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Proof that running with scissors can sometimes yield positive results.

~NSHA

car chain locked up padlock wheels
By Unknown
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Because car thieves never carry any sort of tools with them. ~Not-So-Handy Andy

car windows cars dangerous duct tape locked up
By Ebolavirus
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Especially if I just reversed into another car, and couldn't find the key to the trunk. Which is where I keep my proof of insurance. ~Not-So-Handy Andy

eastern europe locked up toilet wtf
By Unknown
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Before the invention of the diaper, the streets of Europe were a bit more of an eyesore.

~NSHA

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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!