well this has nothing to do with ENJOYING a show with a famous person...but i was at camp and i had to sing a song in front of Demi Moore. her daughter was at the camp and i ended up standing RIGHT in front of her and it was extremely nerveracking!! i hope that counts!
I have, i think, something like 24 or 25 cast recordings. so there aren't many "great musicals" i don't have but there are a few I'm ashamed to admit i don't have. They are: Gypsy, Phantom, Cats, and Brooklyn =( oops.