1) An embarrassing mistake 2) Backside spill 3) Buster Keaton specialty 4) Chevy Chase shtick 5) Slapstick antic 6) Vaudeville move 7) Vaudeville skill 1) Comic strip 2) Gag 3) Stunt 
Pratfall is American and Canadian slang for a fall upon one's buttocks.
a fall in which one lands on the buttocks, often regarded as comical or humiliating. · a humiliating blunder or defeat.