Elisabeth Moss slammed her former Broadway co-star Jeremy Piven over what she was “highly unprofessional” behavior.

During an appearance on Bravo’s Watch What Happens Live, Moss spoke on her time working with Piven during the production of Speed-The-Plow. The official story is that Piven left the production after coming down with mercury poisoning from his predominantly fish-based diet. Moss says that it was just an excuse.

Moss says Piven didn’t look like somebody who was suffering from mercury poisoning when she saw him a month after he quit the production. She says that he was “being highly unprofessional” when he just didn’t show up one day.

In the same interview, she talked about fellow Mad Men co-star Jon Hamm’s “ham.” She said that she’s seen the picture, but that’s all she knows.

Moss can currently be seen on television in the sixth season of Mad Men. The next season will be the show’s last so it’s anybody’s guess where she’ll end up afterwards.

[h/t: Daily Mail]