Photo via David Shankbone/Flickr (CC-BY)
Proud patriot and father Dwayne "The Rock" Johnson was attempting to explain all this to his baby daughter. She responded by pooping on his head.This was either an artistic criticism of the current state of capitalism and its treatment of the American worker, or it was because she's 9 months old and needed to make doody.
Regardless, it left the wrestler/actor unfazed. It's not like this is the first head trauma he's had to endure.