When the good guy goes bad

Exuberant comic star Robin Williams doesn’t think it’s odd that he has suddenly shaken up his screen image by doing a trio of back-to-back dark roles.

Gone is the freewheeling mania of The Fisher King and the mournful gaze of Patch Adams. Williams has become troubled and sinister on screen - first as the killer in Insomnia and now as a stalker in One Hour Photo.