Matt Damon's an Academy Award-winning actor, but he's not above using potty humor—for a good cause!

In a newly released PSA for World Water Day, the 42-year-old actor-activist lends his voice to a funny yet very informative campaign.

"Quick, what invention saved the most lives in human history?" an animated stick figure, voiced by Damon, asks. "The answer is the can, the john, the porcelain throne, the bog, the foreign office, the Thomas crapper. That's right, the toilet!"

"Whatever you choose to call it, the toilet not only provides a tranquil escape from nagging bosses, spouses and children, it's also a fast and sanitary way to dispose of waste separate from the water we drink and bathe in," he explains.

But not everyone has this luxury so many of us take for granted.

"Without toilets, human waste and bacteria seep into the water supply, which makes people sick, especially kids," he says. "Half of the world's hospital beds are occupied by patients with water-related diseases such as diarrhea and intestinal infection. These diseases kill 10,000 people a day, nearly all of whom are in the developing world…and yes, death by diarrhea is as pleasant as it sounds."

"So celebrate your can, as you can!" Damon adds. "And would it kill you to donate a few bucks, or maybe light a match?"

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