Somehow I didn't know about this already, but a quick Google search will confirm that today, March 4, is indeed Game Master's Day. Apparently this has been celebrated since 2005 or so.
Therefore, I'd like to say Happy Game Master's Day to me, to Ryan, Andi, Jason, and everyone else who has ever run a game. It's not easy but the rewards are great. It is indeed my absolute favorite pastime.
To reward myself, I believe I will pick up a copy of the Inquisitor's Handbook.