Nowadays the guy in the middle would take a gun to school, shoot both drivers, half a dozen teachers, every other kid in sight, then himself...

Well, you could always leave the bag off and back it up over a cliff.

Interesting. I guess you could position yourself on the seat, pants around ankles, and then have someone back the SUV up so your suspended off the cliff. Just don't stop reading your magazine and reflexively hop off. And if your helper, the one who helped you into position, was to forget about you, or develop a rye sense of humor, you could spend a lot of time in midair, over a cliff and sitting on a little white seat with your rump hanging out.

As attractive as the prospect of this end may be is it has failed to make my list of top 10 ways to die.

wiring the vehicle battery to the seat could be somewhat entertaining?

The first french rotary engines used castor oil as the engine lubricant. The fumes had a laxative effect on the pilots. One frenchman came up with a trap door affair in his flying uniform and cut a hole in the seat and lower fuselage. Feeling the effects of the fumes, he would dive bomb the nearest german position. A french general learned of this and awarded our hero the Croix de Guerre. What the germans thought of this has never been discovered, but then they had Werner Voss.

Sitting on that little seat and unexpectantly driven back to your suspended over a cliff face could have a similar laxative effect.

I have heard of dumb bombs before, but never a dump bomb...