Katie Couric Pranks James Corden by Falling Down Stairs [Watch]

A lot of people did some pretty lame, not so funny April Fools jokes yesterday.  Some people even got into some trouble.

Not Katie Couric.  She is a sassy, classy lady and she knows how to do a prank right!

Can you spot the look of terror on James's face when he thinks Katie fell down the stairs!?  Poor guy!

But the look of relief when he realizes she's okay is even better! Watch -