Throttle stuck wide open

:banghead: Today i went to the local plaza to go to the bank as i was making my way ther. The car jump into high gear the throttle stuck. My wife thought i was horsing around. That scared the sht outta me. What the hell happened. It stopped after i shut the car off. But know my wife is not to happy. I'm worried it might happen when shes driving :swear: ! Damn galant