You're a total idiot if you go temporarily AFK in a ranked game
"fuck I thought I was at tower" says the vel'koz that walked halfway in to bot lane afk (without telling us he was going afk) and got 4 people killed as we tried to save him (fought the two there thinking the 3 of us could keep them off, as the enemy team collapsed and cleaned up 4).
Seriously guys - your dog can wait. Your food can wait. Don't order pizza that's going to arrive midway through a ranked game. Etc.. etc...
Your house is on fire? Fine. Someone died? Fine. Etc...
There's a massive difference here.
Why do people think their individual time is so important that they can't wait 15min for a pizza instead of starting a game right as they order it? I mean - you're not challenger. You didn't click in to queue expecting a half hour wait and it just came fast. You knew full well you'd be in the middle of a game when it arrived...