Base turn to final, and in a descent. Called for FD's to OFF. Captain turns his FD off, co-pilot leaves his on....Aircraft autothrust selects TOGA, and we begin accelerating into the ground.
That is why you should both turn off, or both leave on the FDs!
If that's happened on an A320 series you've got something else wrong. The autothrust can't 'just' select TOGA it has to be in response to something else. So, what's the other bit of this story.....