And that is saying something with prank giants such as Jimmy Kimmel and Jimmy Fallon in the game. Katie Couric gives them all a run for their money with her April Fools' Day stunt on late-night newcomer James Corden on The Late Late Show.
She is a serious, hard-hitting journalist and author, but this is not something you would see every day: Couric falling down the stairs.
Corden rushes to his guest's side after he thinks she has taken a tumble down the stairs on his set, and when he realizes it is all a joke, he nearly has a heart attack, rolling on the floor in disbelief.
Even Corden's other guests are impressed, and Jeremy Piven points out how priceless the host's reaction was.
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