1) One human player will always be Ike or Marth. If there is a computer player in the game, then whoever dropped out would have been Ike or Marth if they had been able to stay connected. No exceptions.
2) Anyone using Toon Link must only use his up-special move or his down-air move. No exceptions.
3) Anyone using Marth or Ike will not know how to use their Final Smash properly.
4) Anyone who uses a Landmaster Tank will roll off the stage within 5 seconds of falling onto the screen. No exceptions.
5) Anyone using Yoshi will have at least two (2) self-destructs resulting from his side-special move. No exceptions.
5a) The above applies to Luigi and Pikachu, except that they will normally only self-destruct once.
6) Every few battles, one player will stand there and try out all of their character's taunts.
6a) They have also never used that particular character even once before. They will end the battle in last place.
7) Anyone using Jigglypuff is considered an extremely good player and must be avoided at all costs.
8) Anyone using Donkey King is restricted to using his down-special move the entire battle. No exceptions.
9) If one of the players is using Peach, they will always get the Smash Ball. No exceptions.
10) Anyone causing significant lag will always win, unless there is a computer player.
10a) If there is a computer player in a laggy battle, then it will end the battle in first place.
If anyone else has anything to add ... feel free to do so. This is more gamelike than a General Entertainment topic, so it is going into MBG.