Easy.. my first car, 1983 Nissan Bluebird from Hell. It was posessed (no..really, it was!)
This was a car that would cut out at any given point in time without warning, ie: I could never drive in the right hand lane for fear I could cause a traffic jam). It was thought that there was a problem with the fuel line somewhere, however no-one could ever find it.
example of being posessed: One night, I reversed out of the driveway to go to work, I put it in 1st gear - then nothing. Cut out completely, no lights, no radio, no nothing. Wouldn't start - wouldn't even attempt to turn over. My car was stuck in the middle of McPherson St (in Horsham) and I had to move it before the semi's came hurtling down the street. So I went and annoyed the neighbour, who came out, got in the car....and it started first time for him..
It did the same thing right on the border too. My car was literally half in SA and half in VIC.
It too was stolen... on Mothers Day 1999. Stupid theives, they didn't get to far with it anyway, found at Beckman Ave, Highbury down the creek at the reserve there with a busted Chassis..