Both times the lights came on (and stayed on) it happened as I was slowly pulling out of my driveway. They have now miraculously gone off and have stayed off for a full day now. How exciting. On a side note, I got the tires rebalanced (they said they were out of balance a bit) and that seems to have cured the high speed vibration.

Of course, seeing has how I'm me, I've noticed another possible problem: twice now in the past few days when I've had my lights on, there would be an audible "click" and all the dash lights would blink off and come right back on. Couldn't tell if the headlights went off and on as well since it was dawn and the headlights weren't that noticeable anyway. I hope they don't decide to go off and stay off in the middle of the night. Not sure how the dealer can trace this issue...