Vaidya's most notable performance is in a supporting role in the 2009 Bollywood film, 3 Idiots as Chatur Ramalingam (or "The Silencer"). He received strong reviews for his performance. Vaidya auditioned for the role of Chatur while on a trip to Mumbai. After passing the first audition, he was asked during the second to read dialogue from Lage Raho Munna Bhai. Vaidya states that he "just rattled it off without exactly understanding the words ... almost like the speech scene in [3 Idiots]." After being hired for the part of Chatur, he was told not to study Hindi, not to watch Hindi films, and to gain weight.