I nearly had a wreck when they moved the dimmer switch to the turn signal. Kept getting my foot caught in the steering wheel!
One of my first "Oh Shit" moments driving involved a floor mounted dimmer switch. I grew up in the Northeast and my first car was a Chrysler LeBaron that was terribly rusted out from road salt. I was driving one night, stepped on the switch and it was gone. Straight through the floorboard. As soon as it hit the road it was ripped out of its wiring harness and my headlights went out. Fortunately, I was on quiet, country roads that I knew well and was close to my destination. But still a little scary for an inexperienced driver. The whole way I was trying to figure out what I would say to a cop if I got pulled over. "Yes, Officer, other than that part that just fell out of my car, my headlights are in fine working order. No, I haven't been drinking."