George Clooney and Julia Roberts attribute their on-screen chemistry and off-screen camaraderie to a three-letter word: fun. The actors, who have worked together multiple times, including in their new film “Ticket to Paradise,” enjoy each other’s company because they take their work seriously but don’t take themselves seriously. While promoting the movie, they have been playfully teasing each other and poking fun at themselves. Clooney joked about the number of takes it took to film a kissing scene, while Roberts quipped that the movie might be terrible because of their potential for greatness. “Ticket to Paradise” will be released on October 21.