If your accelerater pedal gets stuck what should you not do?

You should not turn the ignition off. Put your foot on the brake and apply steady pressure to stop. At almost the same time put the transmission in neutral. You will safely come to a stop with the engine still running and P/S and P/B still working. Immediately turn the engine off as soon as you come to a stop. Turning the ignition off will cause you to loose P/S and P/B, which is a horrible idea.