Microsoft founder, Bill Gates, of the Bill and Melinda Gates Foundation, came on the set of The Tonight Show with all-around funnyman Jimmy Fallon, with a simple proposition for Fallon: let’s each drink a glass of water.

Here’s the catch: one of the glasses contained bottled water, while the other was very recently a fresh sewage water filtered using Gates’ latest philanthropic effort, the Omni Processor See More Photos https:///yDW0Ev