User blog comment:Inpursuit/GG and demeanor/@comment-81.235.189.244-20111110091044/@comment-155.33.66.202-20111112171933

Gonna agree with this. LoL is the only (online) game I know of where the winners say GG before the losers. Heck, that used to award you game losses in Starcraft: BW in Korean tournaments.