Chantabbai (1986)
Chantabbai is a 1986 Telugu film movie made by Jandhyala and was released on 22 August 1986 . The film was a casting coup in that Chiranjeevi, who was an action hero, was cast as a bumbling private detective in a full-length comedy film with no heroism whatsoever. The film won a lot of critical acclaim and is hailed as a classic comedy. This story was taken from Peter Sellers comic movie A Shot in the Dark.
More at Wikipedia.