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Audience member Joe made a donation to Autism Speaks to spin the "Wheel of Rudd" for a chance to do something unspeakable to the actor.

Stewart was really hoping the wheel would land on "Baby Bird" during Joe's turn, and he got his disgusting wish.

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Then, the "baby birding" commenced. Rudd had to swallow Joe's chewed food.

Viewers on Twitter dubbed the bit "unbelievable," "hilarious" and "disgusting but amazing."

A writer for Gossip Cop rightfully noted, "It was… nauseating but funny. ... It's worth watching."

Well, at least it was for charity, right? Stunts like Paul's "baby birding" have helped raise over $18 million for autism research since 2006.

This video includes images from Getty Images.