I actually pushed a lady's car into a gas station yesterday on way home from work for that exact reason.
she was I a PT Cruiser, and the engine just started revving and trying to go, overpowering her brakes even she said..
luckily, she did have the presence of mind to shift into neutral until she could stop, and then shut off the engine.
she even demonstrated for me, and sure enough, soon as she started the car the throttle went to max.
she had stopped about 100' from an intersection, and there was a gas station just other side on corner, so pushed her across so at least she could get out, get a drink, whatever, safely rather than in the street (and of course, no longer blocking street too).
but now these electronic accelerators are common now (my car has one too, much as I'd prefer it didn't), and I hope they're teaching kids learning to drive what to do if one fails like that. older folks like the one yesterday though, they often don't know that they even have them, and what to do if it happens. like said, she was lucky she did; barreling into that major intersection would have been pretty bad.