Written Rules

The reason "unwritten rules" are unwritten is because they are dumb and objective. You think rickey henderson became the greatest base stealer of all time following em? Hell no, fuck that.
If the pitcher and catcher cant throw me out, then i am taking the base. If you are corey patterson and you have pretty much wasted all your potential, you MUST take that base in hopes of a higher payday.
If you dont want ARod to hit his best in blowouts, how is he gonna win those MVP trophies to escalate his $25 million salary to $25.5? A man's gotta feed his kids.

I also dont have problems with people celebrating before or after the play. For example, watching manny going into his home run trut only to have it hit the wall. Then watching manny busting his ass to 2nd base is funny every time.
As joey porter said "big players make big plays in big games." If you make a big play, you deserve your day in the sun.
If you dont want terrell owens to dance on your Dallas star, dont let him score TDs on your ass twice.

Although i am very against keeping people off the field of play during brawls. If you allow the batter to attack the pitcher BY HIMSELF, then he will have no choice then to use his bat. i rather have 30 people on each team rumble, then have one person going postal with a weapon.

Here are some rules on showboating that i think EVERYONE should follow, written or unwritten:

1. Most important rule of all... "In a seven game playoff series, a team must WIN FOUR GAMES to advance." Almost everyone knows this but on very rare occasions, some teams and/or fans might forget or lose track of # of wins and celebrate and taunt fans of the other team prematurely. This could eventually come back and haunt those teams/fans for the rest of their lives.
   
2. As fans, please do not make dumbass chants that make no sense. This probably go for announcers too when they give players nicknames. Case #1: Coco Crisp leads off today and yankee fans started chanting "Johnny Damon... Johnny Damon..." and i mean the entire stadium. WTF... did i miss something? Isnt Johnny Damon a True Red Sox? It doesnt make any sense. Case #2: Yankee fans chanting "Who's your daddy?" in game 7 of the 2004 ALCS and really getting into it. Hmm... taunting while on the verge of historical whooping is probably not the best timing. Also stop making those dumbass signs with words using letters from E-S-P-N or N-B-C. I did stuff like that in 5th grade during the first year in the US when i didnt speak english. Its really not that imaginative.
   
3. Do not make guarantees then not deliver or make guarantees that have no significance. Rasheed looks pretty stupid after the Cavs game. Zo looks pretty stupid guaranteeing a game 4 victory while down 0-3 in a 7 game series vs some guy named michael jordan. A kicker named Vanderjadgt calling the defending Super Bowl Champs "ripe of the picking."
   
4. As players, do not trash talk or rile up or piss off or show up those "tier zero" ultra-vengeful superstars cuz they will exert all their energy for the purpose of destroying and humiliating you. One such player is Pedro... Case #1A: Gerald Williams charging pedro after getting hit leading off the game, then having pedro no-hit the entire team rest of the way. Case #1B: Who is karim garcia? Another is Tiger Woods and his famous "9-8" which was probably THE BEST trash talking words i've ever heard. Falling in this category, do not trash talk any future hall of famers, with the exception of ARod, as nothing good can come out of it for you.
   
5. Do not trash talk guys that can physically whoop your ass or has AIDS. For example, it probably wasn't a good idea to trash talk a young Mike Tyson before a fight for the sake of boosting pay per view sales. On the other side of the spectrum, you should always be friendly and polite to Magic Johnson because you should not risk of him pulling a Mike Tyson and bite you.