GM's Day: The Hallmark Holiday for RPGers

Ways to celebrate: (some are quite silly)
Hug your local GM. GMs need this.
If you're in the mood, send some love the way of your Friendly Local Game Store.
Dress as your favorite NPC. Bonus points of that NPC is of the opposite sex. More bonus points of you name it "Jackson Gygax."
Create a stat block of your supervisor at work as a D&D encounter -- "Cube Mold, ECL 1" works for me. Bonus points for spamming it to the entire office.
Create a mundane but useful spell: "Divination: Bank Balance," "Summon Pizza and Beer," "Power Word: Sync iPod"
Translate the Harfleur speech from Henry V into Elder Futhark runes, or Elvish. Or Serenity-verse Chingrish. Or translate it back to the original operatic Klingon.
Translate the taunting of the Frenchman from Monty Python and the Holy Grail into, well, French. Or Elder Futhark. Or Elvish, etc.
Compose a Kingon Opera. Translate it to Elvish spoken with an ourtaaaageous accent-a.
Publish a Middle-earth version of Jane's Fighting Ships for each of the Ages.
Offer to "polish" your GM's dice ("Got some nasty crits, I mean scratches, on that d20...")
Wear a Gary Gygax mask when you enter your bank.
Wear a Drizzit mask when you go to the bank. Carry a pair of scimitars when you do.
Treat your associates at work like all of are characters in an old-school World of Darkness LARP and YOU are the Storyteller. Special bonus points for using a Malkavian Vampire NPC.
Take a picture of a gazebo. Make a fold up paper miniture of it. Create an stat block and encounter with it. Run said encounter.
Gazebo. Friends. Boffer weapons. Camera.
Attend a SCA event and ask one of the particpants where the Storyteller is. Be sure to not come out during daylight. Try to ghoul the royalty. Diabolize a herald.
Rationalize Star Wars space travel physics.
Create a lingusitically feasable fantasy language, complete with handwritten scripts with diacritics, spoken dialects including pidgins, offshoots, trade jargon, accents, and loan-words.
As above, except accounting for the invention of the printing press, electronic communications, mass culture, personal computing and the Internet.