Actor Ayushmann Khurrana is thrilled and excited about the first day of "Gulabo Sitabo" shoot with megastar Amitabh Bachchan here on Tuesday.His next, the quirky Shoojit Sircar film, sees him team up with Amitabh.Ayushmann has been a huge fan of Big B since he was a kid and of course, he is ecstatic to learn from the icon. He is grateful to Sircar for casting him alongside the megastar. "Ever since I teamed up with Shoojit sir for 39Vicky Donor39, I have only been wanting to work again with a genius like him. He is a master storyteller and he has a very distinct and a unique voice in Bollywood," Ayushmann said in a statement. "He gave me my big break and I will always be indebted to him for 39Vicky Donor39, a film that made it possible for me to chase my dreams in this cut-throat industry. I39m delighted that he wanted to cast me in 39Gulabo Sitabo39." He also thanked Sircar for making his lifelong dream to work with Amitabh come true. "It39s a jackpot for me and I39m still pinching myself that I will have the incredible opportunity to share screen space with Bachchan Sir and learn from him," said the "Bala" actor. Ayushmann feels he will become a better actor after working with Big B. "As an actor, I look to constantly better myself and 39Gulabo Sitabo39 will certainly make me a better actor because I39m not going to let this opportunity of learning from the best actor of our industry go."I39m equally thrilled and anxious about our first scene together. I think I will be a huge fanboy walking into the set," he added.