Every once in awhile, randomly, my right headlight and my right tail light will stay on after I have turned off the lights, shut off the car, and locked it. They will stay on until I start the car again. It has happened a couple times in the past and the battery never died, but all those times I was only away from the car for one night and I would find it in the morning and it was fine. Just this weekend, though, I was out of town for 3 days and they were on when I came back and this time the battery was dead (obviously, after 3 days).

Does anyone know what would cause these to stay on and how to fix it? I really don't want to pay some idiot $90 just to hook the tester up to my car and then tell me he has to replace computer modules to further investigate and yadda yadda yadda, $200 dollars later..... :/

Any thoughts would be wonderful.