Chavs.
Guys who ask for spare change (Is it just me, or do you get the urge to just punch them in the face?).
Religious people.
Ppl hu tlk lyk dis (People who speak text language)
People who say "lol" in real life and then try to cover it up.
Small children who always are shouting with really high pitched voices.
When someone pretends to be drunk.
When you tell a joke to someone, they find it funny, so they tell everyone else it, then when they ask who told them it, they say your name.
Narutards.
People who think they are hardcore anime fans because they have watched every naruto/dbz episode.
And the grand finale...
Idiots who think anime is cartoon sex and say its crap before they have even tried it, or based on what they have seen before, eg. Pokémon / YuGiOh.