Ozzy Osbourne demanded that a £15million deal to film a second "fly on the wall" series about his family should be signed in BLOOD.
The oddball star and his wife Sharon also said they wanted a new house and psychotherapy for their pets for life.
MTV bosses grudgingly agreed to bloody signatures and limited therapy for the animals. But they drew the line at a new home.
An insider said: "Ozzy and Sharon realise they have a massive hit on their hands and knew they could pretty much ask for anything. So they thought they'd have a laugh.
"Executives were most concerned about having to sign the contract in blood, but Sharon and Ozzy were adamant."
The Osbournes show - which will be extended for another 20 episodes - follows the home life of Ozzy, 53, Sharon and their children Jack, 16, and Kelly, 17.