For me, it's when a player brags about being a pro at playing Riven, Annie, Veigar, Katarina, or Fizz, and all they do is smash their face on one key. cough Riven's Q cough
but in all seriousness ik there's such thing as a pro for these champs, but doesn't mean they're hard to use, yes I play Veigar, but I just find him fun to play. :P
What have you seen as one of those moments where you can't help but facepalm?
Thresh complaining that he can't execute minions with Relic Shield (since the execute damage only applies to melee basic attacks).
Morgana complaining about being displaced by terrain such as Trundle's E or Anivia's W (since being moved off of terrain is not a CC)
Someone complaining when CC doesn't stop Ezreal's ultimate or Lux's ultimate (since cast times will always complete unless the champion dies).
Basically, people who just don't understand basic interactions within the game.
