Equus
Many years ago, in a middle eastern nation, an amateur theater group I did stage crew work for, decided to do that play. As the youngest male in the theater, I was chosen for that role. It's a rather impressive psychological story. The play is based on some true event that the playwright (Peter Shaeffer) had only gotten a snippet of. And while the play may have no resemblance to the actual events (the person who relayed the original events died before the details could be related, and the play was written to try to explain the event), it's still a very good show.
A very interesting experience. It's a fascinating play, go see it if you get the chance (and not just for the opportunity to see someone naked).