Killing Donkey Semen Episode
Was an Expensive Mistake
Sources connected with the show tell TMZ, in addition to the donkey semen stunt -- contestants had to jump a car through a moving train ... a stunt that cost roughly $150,000 to put together ... and now, will never see the light of day.
On top of the train disappointment -- we're told some staffers were baffled by NBC's decision to yank the episode ... because the semen challenge was "hands down the nastiest concept" out of the bunch of other stunts that were killed BEFORE coming to fruition.
As one source put it, "There's lots of other gross stuff, but how do you top donkey semen?" A good question.