Veteran actor Anupam Kher shared his excitement and said that it is a `dream come true` moment for him as he got an opportunity to sing a song in Anurag Basu`s film `Metro... In Dino` featuring Aditya Roy Kapur, Sara Ali Khan, Anupam Kher, Neena Gupta, Pankaj Tripathi, Konkana Sen Sharma, Ali Fazal, and Fatima Sana Shaikh