Improvised Gervais

Ricky Gervais refused to follow the script while filming his Hollywood debut.The comedian was invited by showbiz friend Ben Stiller - who guest-starred on Ricky's BBC comedy series 'Extras' - to play the eccentric museum boss in new family film 'A Night At The Museum' but insisted on making his lines up as he went along.Director Shawn Levy told BANG showbiz: "Ricky came to me before he was due to shoot his scenes and said, 'You know what. I think this will work better with no script.'"Two of his scenes with Ben are entirely improvised. They just bounced off each other."But Ben and the British comedian - who rocked to fame in his hit TV series 'The Office' - couldn't stop making each other laugh.Ricky confessed: "We were so unprofessional. We kept just cracking each other up over and over again."