Ah, good ol'games
Obviously, I have to go with hangman. It really keeps me excited having to hurry and post the correct answer to the puzzle before anyone does (especially when dealing with mr_pikachu, Blademaster and Knight_Of_Time. Of course, others like Fett, CEB, Inferno_Dragon and Mikachu are great for competition; but I was remembering my first days as a player). Also, I found myself laughing every time Blade found a new way to break mr_pikachu's randomizer.
Second, the Whacking game. Wow, I can say for sure that it helped me release daily stress by laughing at the creativity of everyone on this game, and of course, I loved to whack every now and then.
Finally, when I wanted to break my brain, there was the riddle game. The riddles put one's mind to work in many ways while wondering who was the correct pokemon.