You're feeling a little down, so you decide to treat yourself to some theater. You buy the last (really cheap) ticket to a limited engagement off-broadway show while you're at work, then stroll up to the theater a few hours later. And BAM! New theater in NYC.
Just because you can.
*Follow-up: The play actually kind of...well, sucked. A lot. I have my specific and erudite critiques, but I'll spare you. Regardless, the point is that I can participate in this kind of spontaneity, and I LOVE that.