On a recent episode of The Tonight Show Starring Jimmy Fallon, host Jimmy Fallon was challenged to a poop water taste test by philanthropist Bill Gates. In a scene reminiscent of The Princess Bride, Gates presented Fallon with two glasses of water, one containing bottled water, and the other containing water processed from sewage by the Janicki Omniprocessor.

As we’ve written previously, the Janicki Omniprocessor was developed as a way to cheaply and cleanly process sewage in developing nations while also providing power and clean drinking water. Earlier this year, a video released by Gates featured a demonstration of the Janicki Omniprocessor which included Gates sampling the water.