Im not positive about the pic of Arnold your talking about but its sounds like what they call the "suicide" grip...for obvious reasons. I have seen 3 different guys lose the bar and bouce it off of their chests, once it was during a benchpress contest! (suicide grip is illegal in most bp contests by the way) I would NOT recommend you try it. You have to try what feels right for you, I have a standard grip when Im benching with barbells but dumbbells and even machines allow you to experiment with your grip. Keep it safe.