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You yell this at someone who's too distracted to notice you're being a total smug ass. It's like throwing a punch in the face of someone who thinks they're untouchable.
Ha Hakdog! You're so lost in your own brain you forgot I'm here!
Ha Hakdog! You're like a dog who doesn't know it's being fed garbage.
Ha Hakdog! You're so dumb you think you're the main character.