Thenali is a 2000 Indian Tamil comedydrama film directed by K. S. Ravikumar and written by Crazy Mohan. The film stars Kamal Haasan in the title role, along with Jayaram, Jyothika, and Devayani. The films music was composed by A. R. Rahman. The story of the film was inspired by the 1991 Hollywood movie What About Bob? directed by Frank Oz.
Thenali Kamal Hassan is a man who fears anything and everything. Dr. Panchabhootham Delhi Ganesh and his assistant Ramesh Khanna, who are the doctors treating Thenali, are jealous of a relatively junior doctor Dr. Kailash Jayaram getting all the media attention. They decide to derail Dr. Kailashs success by sending Thenali over to him. Soon after their first appointment, Dr. Kailash heads to his home in Kodaikanal on a vacation with his wife Jalaja Devayani and his two children. Dr. Kailash tells Thenali to wait until after the vacation before his therapy can begin, but Panchabhootham asks for Thenali to go meet Kailash while on vacation.The expected happens. Thenali falls in love with Janaki Jyothika, the younger sister of Dr. Kailash, which was vehemently opposed by the latter. The whole film is about how Dr. Kailash goes mad with the antics of Thenali and even begins to suspect that his wife has an affair with Thenali, as she has a soft corner for the latter. He even tries to kill Thenali by tying him to a tree with a time bomb, which Thenali not knowing it is a bomb removes and puts it in the doctors house, causing it to explode and Dr. Kailash, seeing this, suffers a paralytic attack. ........
Source: Wikipedia