mattporter17 said: "If they can handle the text any Shakespeare would be good. Noises Off would be a good choice as well!
I saw "o Off" back about 20 years ago -- it was one of the funniest things I ever saw in my life. But then I saw a revival on Broadway with a very professional cast, but somehow none of the humor came through -- the timing was off by maybe half a second and everything fell flat. It was one of the worst things I ever saw. I'd be very careful with a show like that where timing is everything.
My senior year, we did a show called Play On! It sort of had a Noises Off vibe, but instead of a professional troupe, it's about a community theatre putting on a locally written play, and the author keeps barging into make changes. It's 3 acts, about 2 hours, 10 characters (3M, 4W, 3 either or), and from what I remember it's hilarious.