What is the most annoying abillity ingame?

We all know it: you are walking into your lane and who do you see: Yorick with his ghouls, le blanc with her jumps or kalista with her pull... My question to you people is what is your most hated (the one you think is most annoying) ability ingame? For me it's {{champion:17}} Shroom, because death by something you can't see!
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