When you accidentally buy 2 of the same item early game.
(For Them) when a Trynd dies too fast to pop his ult (which is incredibly satisfying)
When you think you escaped, only to die to Teemo mushrooms in a bush.
When you run to a bush to B, and the enemy has a ward there, resulting in you getting insta-killed.
When the entire team is ranged carries (somehow we won...)
Seeing a team fight start, while you're playing Kennen; running in with your speed boost and ult; only to watch your team run away, as you get focused and die right away. Same goes for Lee Sin.
Missing skillshots on enemies that'll die in 1 hit.