The best thriller i can say u from hindi films r KHOJ-Rishi kapoor,KHAMOSH-Amul palekar,ITEFAQUE-Rajesh khanna,TEESRI MANZIL-Shammi kapoor, and many more.i will let u know later.
Lot of hindi movies start out good, but by the time the movie is done it loses the thrill. Most of the ending are stupid and irrelevent. Well some of my favs are- Old- Gumnaam, Teesri Manzil, Humraaz(old one) I also liked, KHILADI,100 DAYS, SAMAY, AJNABEE, BAAZIGAR,GUPT etc. Also DARR was a thriller because it kept us at the edge of seats thinking what is he's gonna do next. In the past 5 years I don't think we have seen any great thriller movie. Most are just about average, none of them stand out. Hoping to see some more good thrillers in near future.