They don't happen often and when they do they are mostly panned for some reason, but I like a good ensemble comedy - eg. 'Connonball Run 1 and 2', 'Rat Race', 'Mars Attacks!' - and came to thinking, "who would I cast in my own ensemble comedy?" They are mainly zany, off the wall and many parody the big stars themselves. Well, you have a cast of 20, which names, alive today, would you cast? Musicians, actors? You can also elaborate on its theme if you want - ie. road movie or sci-fi comedy.