My Toyota had the unintended acceleration issue. I made my way to the dealership with a lot of early upshifts to 5th, shutting off the engine, and banging the pedal with my foot.
After about 15 minutes the mechanic and the manager came in to the waiting room trying very hard not to laugh. They held up my floor mat and pointed out how the frayed edge of it was tangling up in the gas pedal. One new floor mat and I was on my way :)