When you go to a lane and your counter is there...
THAT'S NO EXCUSE TO SWITCH LANES!!! Last night there was a Fiora who decided to take my place mid (I was playing Xerath) and decided upon Xerath support because Rammus was top. We also didn't even have a proper support anyway. So Fiora ended up feeding and even told us that she was going to "show us how it's done". Really showed us by going 12/14/3. Because of that she cost us the game. So please, just wait until your lane is over and try not to feed in the process.