pratfall

from WordNet (r) 3.0 (2006)

pratfall
    n 1: a fall onto your buttocks
    2: an embarrassing mistake [syn: {blunder}, {blooper},
       {bloomer}, {bungle}, {pratfall}, {foul-up}, {fuckup}, {flub},
       {botch}, {boner}, {boo-boo}]

from Moby Thesaurus II by Grady Ward, 1.0

40 Moby Thesaurus words for "pratfall":
      bloomer, blooper, bobble, bonehead play, boner, boo-boo,
      boob stunt, boot, breakdown, collapse, comedown, crash, cropper,
      culbute, deflation, dive, downfall, dumb trick, fall, flop,
      fool mistake, foozle, forced landing, foul-up, goof, header,
      howler, louse-up, muck-up, nose dive, plunge, screamer, screw-up,
      smash, spill, sprawl, stumble, tailspin, trip, tumble