Hopefully Sally Field doesn't have much of a long-term memory, because Robin Williams is going to try fooling everyone with an old lady costume again. The Hollywood Reporter claims Fox 2000 has started development on a sequel to Mrs. Doubtfire, the 1993 comedy in which a divorced dad pretends to be an elderly Scottish nanny so that he can see more of his kids. Also so that he can get away with throwing a lime at Pierce Brosnan. Williams and original director Chris Columbus are attached, though their participation is dependent on the script--currently being written by Elf and Zoom screenwriter David Berenbaum. As of yet, details of the new script woefully lack the words "goes undercover with Big Momma."