Just watched this Top Gear flick from Youtube
I have a friend whom with we keep doing that kind of stuff whenever we are driving somewhere. Putting the seat heater on is the by far the most common one. It's exactly like in that video.
Once we had this Toyota Land Cruiser from work. It's 4 wheel drive off road car, but you can make it rear wheel drive with a switch. So it was clear what the game was in that car. Extremely slippery icy places and bad tires. Good to drive with 4 wheel drive, but fucking horrible with rear wheel drive. When driving to a corner the one who was riding shotgun put the car into rear wheel mode without driver noticing. Funny stuff... Drifting unintentionally almost makes you shit your pants :D.
Any other ways to kill time on road trips?