I have 3...
Cats- I had the part of Grizabella in our abbreviated version of Cats... I got to see it this year for my birthday and it was THE coolest thing EVER! I admit.. Memory made me cry...
Wicked- I so totally relate to Elphaba(The future Wicked Witch Of The West) I have yet to see this one. but I do sing Defying Gravity while doing housework.
Avenue Q- I haven't seen this one either but based on the soundtrack... I really want to. Anything with a 30 second song about a guy not wearing underwear has GOTTA be funny...