Three different types of super-weird human interactions you've probably had. A lot.
If an alien ever immigrated to Earth, he’d be a social disaster.
He’d try his hardest to learn by observing how humans behave, but it wouldn’t be easy — he’d see someone ask a stranger for a cigarette and he’d go ask for a sip of someone’s latte. He’d see a couple kissing on the street and he’d go try to kiss the policeman on the corner. He’d stare. He’d get food all over his alien face. And when he got tired, he’d lie down on the sidewalk.