George Clooney's hit the town two nights in a row, with his second premiere at the London Film Festival. The Hollywood superstar walked the red carpet for the British premiere of The Men Who Stare At Goats on Thursday. The comedy is based on Jon Ronson's book about a secret US army unit in the 1970's which, he claims, believed troops could become invisible and kill goats just by staring at them. Clooney, 48, plays a hippie soldier trained for psychic and peacful combat. It is second appearance at the festival, but not his last. His third film Up in the Air is also showing. The actor said he is enjoying the type of films he is making at the moment: "I've done some films that were comedies but weren't supposed to be. Actually, Up in the Air isn't as funny as people think but yes comedies are nice to have around now."