News Katie Couric Nearly Gives James Corden a Heart Attack With April Fools' Prank By Alex Ungerman 4:39 PM PDT, April 1, 2015 YouTube When it comes to April Fools' Day, Katie Couric does not mess around! The 58-year-old journalist makes an appearance on Wednesday’s The Late Late Show With James Corden where she appears to take quite a nasty fall down a flight of stairs! YouTubeNEWS: April Fool's! The 14 Best Pranks of 2015James was horrified. YouTubeA source at the Late Late Show tells ETonline he had absolutely no idea.When Katie broke the news...YouTubeJames' face was everything. YouTubeNEWS: Katy Perry Shows Off Super Short Hair: 'I Asked for the Kris Jenner'By the way, in case you were worried, Katie's stunt double who threw herself down a flight of stairs is named Heidi, and she's fine.YouTubeHere's the whole prank. Today we learned that if Katie Couric decides to prank you, prepare to have your heart stopped.Now, watch Matt Lauer revenge prank Ellen DeGeneres with 20,000 ping pong balls.Matt Lauer Revenge Pranks Ellen With 20,000 Ping Pong Balls This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page.