The house used in 1993 Robin Williams starrer 'Mrs. Doubtfire' had caught on fire recently.
It is unclear how the fire started, but the owner of the San Francisco home, who's a doctor, believes that it was work of some a disgruntled former patient, the TMZ.com reported.
According to fire officials, the arsonist had soaked the doormat with some type of flammable liquid.
The damage to the iconic house, which served as a memorial site after the death of Williams, wasn't serious, and the owner was able to contain it before it got out of control.