NBC has indefinitely stopped production of one of its upcoming competition shows after crew came down with "explosive diarrhea." The Wrap reports that about 40 crew members fell ill on the set of "Ultimate Slip 'N Slide," as they collapsed and suffered from violent bouts of diarrhea. It was later confirmed that at least one person tested positive for Giardia, a parasite that can cause diarrhea. The show, filmed in California and originally scheduled to premiere in August, has contestants take on giant slippery rides for cash prizes. A spokesperson says that NBC is investigating the situation, but there is no word on what may have spread the parasite.