When I was doing my PPL, I activated the throttle mounted starter button whilst in the cruise, thinking it was the mic tx - getting all of that co-ordination into place was the hardest for me ! The ship sprang to the right by a good 45 degs before I realised my error ! The FI grabbed the controls, went white and shouted " what the **** was that?" My first lesson in why switches are guarded !! ( Or should be ! )