VIDEO: Elisabeth Moss Calls Jeremy Piven 'Unprofessional' for Leaving SPEED-THE-PLOW on WATCH WHAT HAPPENS LIVE

On last night's WATCH WHAT HAPPENS LIVE, former SPEED-THE-PLOW star Elisabeth Moss had some choice words for Jeremy Piven, who made headlines in 2009 for exiting the show due to mercury poisoning.

"What besides eating too much sushi caused Jeremy Piven to leave SPEED-THE-PLOW?" Host Andy Cohen asked her.

"That's a good one, that's a very good one, I could Go On and on...Being highly unprofessional."

Miss added: "He just didn't come back one day...I saw him, like, a month later at The Golden Globes when he was supposed to be really sick."

Check out the full clip (featuring ARRESTED DEVELOPMENT's Jessica Walter), beginning at the 4-minute mark, below!

When Piven left David Mamet's Speed-the-Plow, he was replaced by Tony-winner Norbert Leo Butz and William H. Macy. The show's producers then took their complaint to the Actors Equity Association, claiming Piven's Exit jeopardised show earnings.

The cast for the 2009 production also featured three-time Tony-nominee Raúl Esparza (The Homecoming, Company) and Moss (Mad Men). Neil Pepe (David Mamet's Romance, Ethan Coen's Almost an Evening) directed.