Todd Williamson/NBCUniversal via Getty

A prank gone wrong taughtWill Fortethe dangers of taking a joke too far.

BeforeSaturday Night LiveorLast Man on Earth, Forte tested his comedic sensibilities on his unsuspecting parents.

Instead, he immediately thought back to the worst.

Will Forte, “The Four Seasons” at the SLS Hotel in Beverly Hills, CA on April 11, 2025

Will Forte at the NBCUniversal FYM Emmy Luncheon on April 11, 2025.Credit:Todd Williamson/NBCUniversal via Getty

“I have an awful one,” Forte began reluctantly.

Im not even going to tell it."

But after some encouragement from Evans, Forte decided to share the disturbing trick he pulled at 14.

Will Forte and his mother, Patricia Forte, at the Critics' Choice Awards in 2016

Will Forte and his mother, Patricia Forte, at the Critics' Choice Awards in 2016.Jeff Kravitz/FilmMagic

“Its awful,” he warned.

like feel free to cut this out."

I wrote on a piece of paper, Im like, ‘I’m so sorry, Mom.’

Will Forte and Val Kilmer were longtime friends

“Hearing her scream, it was the worst!

It was the worst thing,” he recalled.

“And I immediately popped up ‘Mom Im kidding!'”

Will Forte and Lorne Michaels at the Museum of the Moving Image’s honoring of Michaels and Stanley S. Hubbard on May 11, 2009 in New York City

“It did teach me, like, ‘Oh, not everything is funny.

There are things that hurt people,'” the comedian said.

That one bad memory aside, Forte also pulled plenty of harmless pranks on his parents.

Watch Forte’s fullHot Onesappearance above.