Gas pedal does nothing.

This has happened to me on two occasions.
I went full throttle acceleration to 70 mph.
When I slowed down to stop for a light my gas pedal did nothing.
It was just dead. I shut off the car and restarted it and all was fine.
I remember reading a thread about this some time ago but I can't seem to find it.
Has this happened to anyone else?
I have tried to make this condition happen but I can't reproduce it.
The fact that it happened twice rules out a fluke.
Thanks for any help or info.