WATCH: James Corden in sheer horror when he’s pranked by Katie Couric

"Oh my God. Katie Couric just died.'"

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.