Yesterday I took a day-long play writing course at the local arts center, Writers & Books, from Paula Marchese. It was a lot of fun. She began by having us write a short scene between two characters, with two restrictions. First, no speech could be longer than four words. Second, the scene should start with "I'm here" and end with "It's not right."
I do a similar exercise (with fewer restrictions) when I teach fiction, but it's much different sitting on the other side of the desk! Stripped of the additional narrative tools available to the fiction writer (description, action, thoughts, exposition), I produced a scene but not one I particularly liked. The characters were clichés (well, we did have only ten minutes). We then went on to cover other aspects of play writing that differ from fiction writing, including how to use the space on a stage. We discussed short scenes from A Streetcar Named Desire and Closer.
Several SF writers I know also write plays, many of which have been produced, including Jim Kelly, John Kessel, and Craig Delancey (I'm sure there are more). I'm not saying I want to do that. But the course was a fresh perspective on story telling, and that is always welcome.