If you're not serious in helping the team at all, it's better to just Surrender
I'm talking about those who went 20/4/5 for example, and since he's handling the game by himself easily, he decides to "play around with his food".
Its behavior like this that pisses me off, be it ally or enemy. First of all, that just shows pure Unsportsmanship. Second, this type of behavior wasted tons of times where games would have ended fast & I can just go to the next one. Third, this may be rare, but this kind of behavior is one of the reason why people lost tons of innocent LP in Rank games, mostly where a Diamond got paired with Silvers, carried & decided to play around, only that he got played in the end & lost.
I'm only posting this cz this just happened to me. The whole story can be read in the pictures below (Kalista is the guy).
http://i.imgur.com/I1AH0g9.jpg
http://i.imgur.com/HeBkc2o.jpg
http://i.imgur.com/YpLv6OH.jpg
Yes I did reported her for Unsportsmanlike Conduct, even though I knew I'll never receive the "A negative player has been punished" box.
But still, to all reading this, STOP DOING THIS TYPE OF DAMN BEHAVIOR.