If you're not a real chameleon of an actor and if you're not one of those guys who can really shape-change themselves all the time one of the ways to keep pushing yourself and keep changing is to be in different kinds of movies.
I love Benny Hill. He one of my favourites of aaall time. Like the way Benny did it he was just amazing. Just seeing how he put songs together and comedy and the timing and the sketches. He was way ahead of his time.