'Sons Of Anarchy' Star Tommy Flanagan Scared To Death By Hilarious Prank

Gettyimages | Jerod Harris

We're lucky "Sons of Anarchy" star Tommy Flanagan isn't dead of a heart attack after being on the losing end of an on-set prank.

While filming "Wu Assassins," his new show that's streaming now on Netflix, Flanagan walks into a trailer where a hidden camera is set up.

Everything seems normal for a couple seconds, but then he's suddenly scared senseless when someone hiding in the trailer emerges. Flanagan just about falls over before exiting the trailer to gather himself.

Based on his tweet, the culprit seems to be makeup artist Jennifer Kaminski.

In "Wu Assassins," Flanagan plays a character that would likely not scare quite so easily. He's international crime boss Alec McCullough in Netflix's first ever original kung-fu series.