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A 'friend' who shows up to your party like he owns the place. He doesn't know he wasn't invited. He's just drunk and confused. Basically, he's a human mess.
Hey man, I showed up to your party and no one told me I wasn't invited. What's the deal?
I got here, saw the drinks, and thought, 'This is my house.'
I didn't know I wasn't invited. I thought you were throwing a party for me.