Jimmy Fallon, Bill Gates Drink Something You’d Expect to be Gross: Poop Water [Video]
For his visit with Fallon, Gates brought two glasses of water with him. One was filled with bottled water and the other was filled with purified sewage water, also known as poop water.
Fallon didn't know which was which, and was challenged by Gates to drink a glass and guess which one it was. Gates then drank the other glass.
Check out the video to see if Fallon chose correctly!
Source: Free Beer & Hot Wings