Installed an RFID system into my car, and put an rfid chip into the sole of every pair of my shoes so I wouldn't get locked out of my car anymore. There were other benefits, but yeah...
I think I got locked out of my EJ9 about 15 times in about 15 months. That car didn't have that "hey asshole, you left your keys in the ignition" sound. ADAC (the german AAA) guys in my area got to know me pretty well. Nothing is more embarassing than when the guy recognises you and says "Again, yeah?" when he comes up to the car.