Last week, it was announced that the Maccabees project - billed as Mel Gibson's big comeback - would be shelved indefinitely after disagreements among Gibson and Joe Eszterhas, the screenwriter, came to light. Eszterhas wrote a scathing letter to Gibson, which media outlets got a hold of, and revealed that Gibson unleashed one of his infamous rants on the writer and his family. It looks like those "utter fabrications" that Gibson called him out on may have some truth to them after all, however. During a Costa Rican vacation in December, Eszterhas and his family accompanied Gibson to his home. Fifteen-year-old Nick Eszterhas caught Gibson on tape, much like his baby mama, Oksana Grigorieva, did during their ugly custody hearing. Eszterhas claimed in his letter that before dinner one night, Gibson went ballistic after seeing an unflattering picture of himself and his daughter, Lucia, in which he was graying and balding. "You were staring at the photograph of you and Luci, your beautiful little girl ... and you suddenly exploded. You hurled your cellphone into a wall and started to scream, 'I look so f*cking old! I look horrible! That f*cking whore is destroying me! She's taking my looks! I hate her! She's destroying my life!'" he wrote. The recording Eszterhas's son captured seems to back up his claims, with an irate Gibson screaming about the film. "Why don't I have a first draft of 'The Maccabees'? What the f*ck have you been doing?" he bellows. About Grigorieva, Gibson shouts, "I am earning money for a filthy little c*cks*cker who takes advantage of me!" Eszterhas fears for Gibson's sanity, according to The Wrap, which published a transcript of the recording, and that's why he allowed it to be released. Radaronline.com claims that a source close to Gibson even claims the Beaver actor was diagnosed and is being treated for bipolar disorder. Meanwhile, Gibson's camp is exploring legal avenues to sue Eszterhas. TMZ reports that his people are looking into whether Costa Rican recording and privacy laws were violated.