This is a question that is directed mainly towards regional pros or really good bowlers as a whole.  
(my story)
You walk into the lanes smelling the fresh scent of lane oil on the lanes.  It's 9 o clock in the morning and your league is about to start.  you unpack your stuff, and roll a few practice shots.  everything is feeling great.  Your mark is perfect and the ball is Carrying no matter where you put it in the pocket.  You start bowling for score, and you start stringing the strikes.  (you've shot 300 before so you don't think a whole lot about it), you get to 9 or 10 in a row.  Crowd starts gathering.  roll the 11th one, perfect!..  last shot you roll, another perfect shot and you roll 300.  Now this is the first game of the day and you know that you still have 2 more games ahead of you.  So you try not to get overly excited about the 3.  You have everyone comming up to you asking to shake your hand and everything,  You kind of just want everyone to go away so that you can just concentrate on your bowling again, but you don't want to be rude and refuse to shake their hand.  You start the next game and get a couple strikes, and here your only 2-3 frames into the game and you hear people behind you saying, "well here we go again", or asking you if your going for 3 again or the all out best question "you going to shoot 900?"  you go up on the next shot and trying not to think about what everyone has been saying you roll your shot, but something is wrong and either you don't hit pocket or you just flat out don't carry.

Now, for those of you who have rolled multiple 300s in a set how do you get past these annoying onlookers and just concentrate on your game?  I know that experience has a lot to do with it, but geez, it really does get frustrating.

Jeremy
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"Strive to be perfect,  that is afterall the only way to become perfect."

"If you compare yourself with others,
you may become vain and bitter;
for always there will be greater and lesser persons than yourself.
Enjoy your achievements as well as your plans."

Taken from Desiderata

Proud user of Columbia 300 and Visionary Bowling Products

I try to shrug off the congrats with "Eh I got lucky". Ive never shot 2 300s in a set. I did have 300 followed by the front 9 earlier this year. Someone asked me how many honor scores that was for this season after I shot the 300. I politely answered with the numbers and a buddy of mine said "Tack another 800 on there". I said, "We'll see, you never know what'll happen".

It is tough to keep an even keel but figure this---during your 300 you were in complete control and that is keeping your inner demons in control. Outer demons for the most part are much less affective in my mind. Yes they can be a distraction, but relax and have fun with it. Shooting an honor score is fun---so adding to it is that much more fun.
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Only Losers Feel Pressure
www.thetimekillers.com

Or you could be in my situation. Ive had the front 9 5 times this year. 1st 2 i had just bad pin carry. 4 pin (ball was high by 1 board) then a stone 8 pin. The last 3 were from amatures seeing their 1st possible perfect game. Each 1 of the last 3 front 9 games I had someone in my downswing completely yell out "YOU CAN DO IT!!!" as loud as they can. The best you can do with everything going on is just try to tune out everything to the best of your capabilities.

My top 5 games of the year:
279 (high pocket 4 pin)
279 (stone 8 pin)
278 (pulled the ball when someone yelled out you can do it)
277 (over rotated the ball when someone good shot)
276 (pulled it when someone yelled go for it)

Normally I can tune out that stuff but when its almost totally quiet its kinda harder to do.
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Mike Zadler
NE Lake County IL
Brunswick Equipment
Sanctioned Highs:
775 Series/288 Game
Sanctioned average (2004/2005)
194