Santhanam-starrer Tamil horror-comedy "Dhilukku Dhuddu" has grossed over Rs 12 crore at the box-office on its opening weekend in Tamil Nadu."Thanks to the long Eid weekend, the film has turned out to be very successful. In the four-day weekend in Tamil Nadu, it grossed over Rs 12 crore and that's a phenomenal start," trade analyst Trinath told IANS.Directed by Rambala, the film is partly a spoof on horror-comedies."The spoof angle really worked in the film's favour. The masses loved it," he said.Also starring Shanaya, Saurabh Shukla and Anand Raj, the film was produced by Sri Thenandal Films.