BOLLYWOOD actor Saif Ali Khan's childhood dream was to become a secret agent but a comment by his cricketer-father Mansoor Ali Khan seems to have changed his life. “I wanted to be a secret agent but my dad told me I will get shot, so I became an actor,” Saif told students of Ryan International School during a programme in New Delhi. Khan, the son of former cricketer Mansoor Ali Khan Patoudi, said earlier he wanted to be an astronaut also as he loved reading about space. Asked how naughty he was at school, the actor said, “a girl at my school had really long hair but she had to cut them short after I applied gum on her hair.” He said his favourite subjects were Geography and English. “Geography because I was curious to know about the world but I hated Maths and Physics,” he added. Khan was interacting with students as part of oral hygiene awareness programme organised by Colgate.