the.com/pratfall

The dignity tax you pay for having a body in public.

means A fall onto the buttocks, or more broadly, a humiliating public blunder.

from Borrowed from circus and vaudeville slang, where 'prat' meant the buttocks (a bit of old thieves' cant/underworld slang going back centuries). Stage comedians turned the literal rear-end tumble into an art form — the pratfall — and by the mid-20th century the word had fallen upward into general use for any public, dignity-smashing flop.

origin
prat meant buttocks in old slang
psychology
competent people become more likable after one
comedy rule
works best on someone already seen as skilled
distinction
a pratfall is accidental, slapstick is rehearsed
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