George Clooney loves playing pranks on people, and it apparently doesn't matter how venerable you are, or even how old you are. On 'Late Show' (Weeknights, 11:35PM ET on CBS), he detailed a pretty involved prank he played on then 90-year old Walter Cronkite.

Cronkite was invited over for a dinner gathering, and Clooney told him they dressed up for it. But when Cronkite came out dressed nicely, he was shocked to see everyone else sitting in their robes. But when he left to change, that's when Clooney's prank really kicked into high gear.

"It took him a while," he said of Cronkite getting changed. "And while he did we all ran upstairs, changed and put on suits."

But when Cronkite showed up in shorts and saw this display, he simply walked past all of them and jumped in the lake.