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

by Alex Ungerman 4:39 PM PDT, April 01, 2015
Photo: 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!

Photo: YouTube

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James was horrified.

Photo: YouTube

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

When Katie broke the news...

Photo: YouTube

James' face was everything.

Photo: YouTube

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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.

Photo: YouTube

Here's the whole prank.

Today we learned that if Katie Couric decides to prank you, prepare to have your heart stopped.

Photo: .

Now, watch Matt Lauer revenge prank Ellen DeGeneres with 20,000 ping pong balls.