Katie Couric Nearly Gives James Corden a Heart Attack With April Fools' Prank

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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!

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James was horrified.

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A source at the Late Late Show tells ETonline he had absolutely no idea.

When Katie broke the news...

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James' face was everything.

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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.

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Here'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.