Shaco Bug
Played an All for One match, bought the skin boost, we played Tahm. They played Shaco.
Whenever they used their clones there was a problem. Could NOT kill them. They wouldn't die until their time was up, regardless of whether or not we W'd or Q'd or even Auto'd them to death. Thus, Shaco gets more free damage to hit you with (free autos from clones) and completely ruined the game for me.