Community creator Dan Harmon is feuding with Chevy Chase, who reportedly walked off the set during filming, and was the subject of a nasty speech Harmon gave at the season wrap party.
Sources say Chase abruptly left the set of the NBC show in a huff last month because he didn't receive a script for that day's scenes.
Later at a wrap party, sources say Harmon gave a "F*ck you, Chevy" speech in front of the actor and his family, and then encouraged the crew to join in on the hate session.
Chase replied with a nasty voicemail (listen to part of the NSFW message here) that Harmon then played for a group of people.
The former Saturday Night Live cast member has a reputation for being difficult, but this rift could be bad news for Community, which has established itself as one of NBC's highest-rated comedies.