Cannes is a circus, so you have to have fun with it. Everything suddenly becomes funny. And the promotion of a movie - that's where you really need to be a good actor. You need to make journalists believe that what you're saying is just for them and you've never said it before, even when you're talking about the same film over and over again.
Being an actor only came about because Arnaud Desplechin, the guy who did 'Kings and Queen', had this curious idea to think that I could be an actor, but I had never acted before, and I was supposed to direct my own film!