Why is my car accelerating on it own?

What is your question?

It has happened twice now. I'm driving and all of a sudden my car will begin to accelerate without me pressing the gas pedal. Second time it happened, my brake pedal would not let me press it down.. i almost hit someone but managed to pull the e brake and put the car in park. Mileage is 145,348 and my cruise control does not work. When the car is turned back on, the rpm redlines.