I went to see Noises Off last week (The Play That Goes Wrong was supposedly inspired by this), it was absolutely laugh out loud hilarious. It's moving to the West End in Sept, so if you like plays and you like a laugh, I highly recommend it.
I saw the original in about 1980, and the last revival (the latter not so good because my hearing had packed up and I was too far back). The original was absolutely hilarious, though, and the revival probably was too.