I definitely second TheBlackSheep's "The Laramie Project". Being in that play and watching many versions afterward definitely has been a benefit to my life.
I'm rather fond of Lend Me a Tenor, but I also love Midsummer Night's Dream and The Importance of Being Earnest. But I haven't actually seen any productions of most of my favorite plays. I did play Maggie from Lend me a Tenor for my acting final.
Haha, yeah 50000 should have been cooler. My sister is one of those girls that wears too much eyeliner. Poor high school fads and the people that succumb to them...
I asked that question, so obviously The Importance of Being Earnest is my favorite. But I have to second Arsenic and Old Lace and A Midsummer Night's Dream.