 Aditya Chopra (qv) had lots of trouble filming the scene where Raj  (Shahrukh Khan (qv)) jokes with Simran (Kajol (qv)) about the  previous night. The reason was that every time Shahrukh Khan (qv)  would open his shirt, Kajol (qv) would not stop laughing. The  pictures of the lips on the chest were drawn by Kajol (qv).