If you were creative and knew something about cars, you could pull one of many fuses from the fuse box. On cars I've serviced, the computer fuse is always in the driver kick panel, so just rip off that panel and start yanking fuses while watching the road.
Unfortunately, this is probably considerably more dangerous than driving while on your cellphone.
Being distracted while driving is less safe than simply driving--given that your car is in good working order. If you have a stuck accelerator, you're going to crash if you can't fix it. I'll take the distraction and possible loss of reaction time over the sudden and guaranteed death of flipping a curve at 120+, personally.
Please consider the entirely of your own scenario. Bending down awkwardly and taking your eyes off the road to get at fuses under the dash could well kill you if you are in an out of control speeding car.
Most of the other actions suggested can be taken while in standard driving posture. Those will be much safer than reaching for fuses under the dash.
It's not the first solution. It's just a last-ditch effort to try. In other words, it "could well kill you". I'd much rather take the "COULD" route than doing something that will darn sure kill me, i.e. speeding uncontrollably.
Unfortunately, this is probably considerably more dangerous than driving while on your cellphone.