Jason Isaacs just shared a fun anecdote from his first day filming Harry Potter and the Chamber of Secrets, and a line that he ad-libbed. Isaacs spoke to Empire Magazine about his new movie The Salt Path,

Some of the dialogue from Jason Isaac's Lucius Malfoy in the Harry Potter series wasn't in the script - it was made up on the spot by the accomplished actor. Isaacs got talking about his improvisation skills while in conversation with Jesse Tyler Ferguson for the podcast Dinner's On Me.

A s Harry Potter fans keep gearing up for the franchise revival via the HBO series, one former star looks back and reveals some very interesting details about making the iconic fa