Ranbir Kapoor has started stammering, well not in real life but for his upcoming movie Ajab Prem Ki Ghazab Kahani. The romantic comedy directed by Raj Kumar Santoshi stars Katrina Kaif and Upen Patel along with Ranbir. Santoshi has incorporated a distinct look and mannerism for all the characters in the movie.Santoshi believes Ranbir will get sympathy of the audience for his stammering act in the movie. It may be recalled Shahrukh Khan's 'Ki..Ki...Kiran' in the movie Darr has been a tag line for him till date and the movie took him to greater heights in spite of him playing a negative role in the movie. It remains to be seen whether Ranbir strikes gold with his stammering or embarrasses himself on screen.