Liam Neeson makes terrifying prank call to Maggie Grace's 'awful' ex

Liam Neeson recently made a terrifying prank call to co-star Maggie Grace's awful former boyfriend who left her "a little bit heartbroken."

The 31-year-old star told Conan that she was kind of a hot mess after the breakup and told Neeson about it because he always asks, the Daily Star reported.

To which the 62-year-old actor responded that it was important to set Grace's unnamed former boyfriend straight and he slipped in to character to deliver his infamous warning in a hilarious prank call.

Liam jokingly threatens the ex - who he refers to as "pond scum" - telling him that he had made two mistakes; first mistake was dating out of his league and ended the phone call with the reassuring message: "Now you get your s*** together.