You may have heard recently that Shaquille O'Neal was quoted insisting that Earth is flat.
One of the big challenges with dry humor like sarcasm and dense satire is that it can be very difficult to tell a well-delivered joke about an alarming or absurd idea apart from sincere belief in that idea.
Shaq learned that lesson the hard way recently while chatter all over the internet expressed their confusion and frustration with how such a major public figure, who otherwise seems fairly sensible, could actually believe the Earth is a flat object.
On Jimmy Kimmel he explained that, yes, he was absolutely joking.