For shits and giggles, WIkipedia has a written list of the unwritten rules (does that make them un-unwritten?)
Here are some:
- Do not bunt to break up a no-hitter
- Do not swing on a 3–0 count when your team is comfortably ahead
- Do not spend your time admiring a home run you hit
- Do not steal bases if your team is ahead by a significant amount
- Do not work the count if your team is winning or losing by a significant amount
- Do not walk in front of a catcher or umpire when walking to the batter's box
- Do not stand on the dirt near home plate when the pitcher is warming up
- Do not speak to a pitcher who is in the process of throwing a no-hitter
- A pitcher who is removed from the game in the middle of an inning must stay in the dugout until the end of the inning
- A pitcher should not indicate displeasure if one of his fielders commits an error
(and they also mention not mentioning "no-hitter" during a no-hitter)
I think bunting to break up a no-hitter is OK if the intent is to win the game. Not so OK if the only intent is to avoid your team's embrassment of being no-hit.
(What do we think of, say, some fictional baseball player yelling, "I got it!" as he runs from 2nd to 3rd during a pop-up?)
Some of these bring me back. I still find it hilarious how angry some of the D-backs got. Davis brought the tying run to the plate!