Because car thieves never carry any sort of tools with them. ~Not-So-Handy Andy
That banging sound? It's just my ummm, golf clubs rattling around. ~NSHA
Alright guys, we need to talk about your behavior. Cup's been telling me you touch him constantly. ~Not-So-Handy Andy
Add more locks and crappy tape over your tail lights and he may stay in there.
~NSHA
Let me just unlock the gate, I'll be there in 2 hours after I figure out which key goes where. ~NSHA
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!