I'd just do my best, and play the board. I mean, how could it hurt to give it your best shot (even if you're going to get crushed)?
D Class vs. GM? What's a guy to do?

This article surfaced a few days ago on the main page:
http://www.chess.com/article/view/openings-for-tactical-players-how-to-beat-a-grandmaster
I believe it deals with the question you posed.

Consider it a privilege to have had a chance to play him. Try to glean whatever you can from the experience - hard with blitz, but hey...

I'd consider it a thrill to play an IM or GM, blitz or standard play.
I guess I'd feel too self-conscious and wouldn't enjoy the experience much...I expect they are mostly amused by our moves...so I'd try to take it lightly and just try not to blush when I make a heinous move?

Well a D player vs a GM is virtually a 100% win for the GM as long as he's not drunk (and even then...). The best you can do is try to get something out of it.
For slightly more realistic situations (maybe for against a 2000 or something) some people say play sharp, tactical chess. While you may get the occasional rare win, most of the time you will get crushed mercilessly. If you play solid you'll lose a lot too (though more slowly), but you have more shots at a draw than you would for winning with a tactical opening, so just do what you want, in fact play your normal game.

Try to spring some gimmicky obscure trap on him that maybe he's never seen before. Something like Legall's mate (although he's probably seen that) where maybe he'll think you're hanging your queen just because you're a bad player. Just brainstorming.

But being a D player has some advantages over being a GM. For instance, look what will happen if both players continue to play until they are 65. A GM's rating will probably drop about 200-300 points. He will stop playing actively and retire from playing chess. He will miss it greatly, after all look how much time he put into it to become a GM. A D player's rating, if he gets to be 65, drops 200 points, what the heck! He can keep on playing for twenty more years and never feel badly at all! After all he is use to losing. I envy the D player!
Play your best and feel honored just to be on the same board as a GM. It's a rare opportunity that very few of us amateurs ever get to experience.

If the "2300 in your mind" title is open I'm going to claim it.
Ok, here's how ya plays chess, boys. Ya see first you gotta check your six....

im around 2300 strength (i dont ever go to tournaments but i have many friends who are titled and i play them a lot), but i very often play very weak players, (coffeehouse friends) simply becuase i like to play. now and then a 1600ish player can beat me, IF he plays absurdly agressively and just throws material at me. If he doesnt i can pretty much jsut play autopilot moves and wait for the game to win itself. Really, just sac every pice you can and try to always have him on the defensive with the center in your control. then you may have a chance. the messier the game is, the more accidental pleasant suprises may occur. just keep a look out for mate in 3s
Thompson, Charles M. from Georgia, USA. Your last rated tournament put you at a provisional rating of 1559 after wins against 1200-1300s. Granted this was 6 years ago, but in the ten years of listed tournaments you played in, your rating only went up 150 points from 1400. I seriously doubt you play at 2300 strength now. A much more reasonable estimate would be around 1700-1800.
2300 ?!! He just played in the Ga State Chmp in Atlanta last month and he CHOSE to play the under 1600 section . If he really believes he is 2300 level why not play the Open ?! Well, even in the under 1600 group he didnt win it so he obviously does NOT play anywhere near the 2300 level otb. Arm any class player with the latest chess engines and suddenly they believe they can play at the master level ..... LOL

http://www.georgiachess.org/mainframe.html
In Round 2 you drew with a player rated 1163. Master strength players do not draw with rank beginners. Ever.

I've seen a lot of posts by this "5swords" guy since he started hanging around the forums recently. He likes to talk a lot, particuarily in generalities. I've figured him to be about a 1600-1700 player by USCF standards. I think it's hilarious that some of you guys have cyber stalked him to check out his 2300 claim. It's hard to be anonymous when you use your actual name in your profile. whoops.

Wow! What a turn of events in this threadThe moral of this story is, unsupported claims in a Chess.com forum will be analyzed. These are chess players after all, they love analyzing things

riight...i would beat any of you jokers otb...including you reb, you clown. Ill put money on it.
You cant even beat a bunch of sub 1600 players and you think you can beat me now ?! I will soon be living in Ga again and I will certainly play you for money, someone who cant beat a sub 1200 player has no chances with me. I havent lost to any sub 1800 player in about 20 years, I dont even get to play sub 1600 players. I have given exhibitions against such players though. Start saving your money Charles......
So last Tuesday night I played a game blitz game against GM Ben Feingold, resident GM of the Chess Club and Scholastic Center in Saint Louis. That's my first game, rated or otherwise against a GM. I played 1.f4 for fun, pretty much got crushed, I think he at one point gave me back a piece just for fun.
http://main.uschess.org/component/option,com_wrapper/Itemid,181/
I mean, what's a guy supposed to do? I know it was blitz and all, but I didn't even know where to begin and you really just feel totally defeated to begin with. I know it'll happen again as St. Louis continues to draw more GM's to town in Open tournaments, Nakamura and Hess are apparently coming in April for the St. Louis Open.
Do you look at it as a learning opportunity? Kind of hard in blitz right? Do you just concede off the bat? I dunno. Thoughts? Opinions?
Sean