WATCH: James Corden in sheer horror when he’s pranked by Katie Couric
And the award for one of the best April fool's pranks this year has to be awarded to … American journalist, Katie Couric.
It may have been a bit mean to prank James Corden in the second week of his new job, but his face when he thought Katie Couric had just "died" on his show is priceless.
The host of 'The Late Late Show' was welcoming the 58-year-old American journalist onto the programme when she appeared to take a tumble down the stairs on her way to the stage.
Introducing Katie, James said: "And finally, she's a journalist, she's a best-selling author, the Yahoo! global news anchor. Go wild for Katie Couric."
The curtains opened to reveal Katie fiddling with her shoe before the horrified audience watched on to see her trip and fall head first down the set of stairs.
James then rushed over to her aid but his obvious panic was interrupted by the real Katie standing at the top of the stairs.
She then told the worried host: "Up here James! April Fool's!"
Don't forget to check out the @latelateshow tonight to see my #AprilFools prank on this guy! pic.twitter.com/6j7h3kLSJz
— Katie Couric (@katiecouric) April 2, 2015
When the pair were safely back in their seats, James admitted someone falling down the stairs was one of his worst nightmares.
"I can't breathe. That's like our worst nightmare. That is so funny. That is an amazing prank,” he added.
"We've been talking about those stairs. We've been going back and forth. I was like, 'Oh my God. Katie Couric just died.'"
The prank has only added to James' nerves as he settles into his stint on the US talk show.
He previously admitted he was on a "quest" not to vomit before going live on air.
"All you can see is the spotlight from the back of the room on the curtain, just this circle, and you just go, 'Ah, this is going to open in a minute ... and I'm going to have to walk out there and look remotely like I know anything about anything,' he said.
“And then it's just a quest to not throw up on your own clothes. That's the truth.''
Oh poor James, we would have been inconsolable.
Watch the moment here:
