How players deal with a no-hitter in progress is unequivocal. Shut up, never mention it and stay the hell away from the pitcher. -- Jason Turbow
“I’ll tell you why I never did it,” Chattanooga coach Greg Dennis said. “My brother was a pitcher and he would have bludgeoned me. It wasn’t safe for me. I would have hated to have distracted him and take away from the game.
“As an infielder, the last thing I wanted to do is anything that will upset a pitcher, as temperamental and as fragile as they were, I didn’t want to upset them. I wanted to stay far away and let them stay in their own little world.” -- Patti Arnold
Baseball is a unique game in the fact that many of those who play it are some of the most superstitious people in sports. For instance, Wade Boggs apparently ate an entire chicken before every game, and pitcher Mark Fidrych supposedly talked to the ball after each pitch. The level of each superstition ranges from mild to extreme for each individual player, with many of them hoping to continue a success by repeating something they’ve done in the past. However, there are another set of superstitions that exist as general baseball laws. These are quirks and weird rules that entire teams must follow. One of the biggest ones is not talking about a no-hitter or a perfect game while a pitcher is in the process of performing one.
This rule also applies to anyone at the stadium or watching the game from somewhere outside the stadium. It’s considered the ultimate jinx to mention the possibility of the event, and the person who usually breaks this rule is immediately public enemy number one. Strangely, it seems that whenever someone mentions a no-no or a perfect game while it’s happening, it miraculously is broken up sometime soon after. This is the reason that you’ll quite often see a pitcher secluded in a corner of the dugout if he’s closing in on the milestone while the rest of his teammates sit as far away as possible. -- Real Clear Sports