I guess you had to be there to think it was. Maybe it was the nonverbal cues that made it hilarious. Or maybe if someone is drunk it is funny.
Otherwise, it's just plain stupid.
snipe
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‘Lay off those pink Gins, and while you’re at it cut out the starchy foods and take regular daily exercises, because a girl who marries a man who looks like you do at the moment of going to press is going to have the uneasy feeling that she’s committing bigamy.’
--P.G. Wodehouse, “Pigs Have Wings"