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Are you people retarded or humor impaired? The joke uses a time-worn trope, understatement, as a humor device. You can also use overstatement. In this case, the person says, they made a "faux pas", which is commonly a small mistake in etiquette, like using the wrong fork for salad. Instead, the "faux pas" is that she vents a very personal and inappropriate grievance in a very boorish and vulgar way to a close relative on a very special occasion, at a very high-class get-together (as noted by the waiters with white gloves).
Now for god's sake do you get it? Its like, I did a little boo-boo at my sister's wedding, I shot the groom in the head with a shotgun. That's an extreme case of the same type of humor.
Its a somewhat subtle form of wordplay, where you expect one thing (a true, trivial faux pas) and instead you get a big, inappropriate outburst that would, in reality, probably wreck the entire event.
Its also referred to as "meiosis".
http://en.wikipedia.org/wiki/Meiosis_%28figure_of_speech%29
You don't necessarily have to know all the technical dissection of a joke to find it funny, these are tropes that have been around for centuries and this is a popular and common form of humor. I was at a loss as to why answer after answer was "I don't get it."
Have you never before heard a joke based on understatement?
Source(s):
Here's more if you still don't understand the type of humor (which seems to be why all of you are missing the humor in the joke, you don't even understand the TYPE of humor employed)
http://en.wikipedia.org/wiki/Understatement
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- try to be a little less critical but you are right and it is the best answer. thanks