Please don't say "gg" or "ff at 20", 5 minutes into the game.
It's annoying and pisses people off. Thank you.
CONTEXT EDIT: I'm talking about the guy who feeds first blood and whines gg in all chat. That is unneeded behavior that is very discouraging to others. Don't repeatedly suggest a forfeit while we're at our 5th minion wave. Wait until 20 minutes; spamming it won't make it arrive faster.