Don't ban your teamate's champs....

Ive seen 3 reasons that people do this: 2 people want the same champ...second person bans it. Person ques in their champ but someone doesnt pay attention and bans it(slightly more acceptable, but easily avoidable) someone plays a "bad" champ and has it qued in and teamate bans it.

like, seriously, sort it out, youve got ~20 minutes where you've got to count on this person and before the game even starts you've thrown tilt right in their face. if 2 people one trick a champion, figure it out. your chances of winning are still higher if one of you gets it rather than neither.