The late Robin Williams may have made people laugh his entire life, but there was one person he could never manage to crack: his Mrs. Doubtfire costar Sally Field. When asked about Williams' habit of "cracking people up on set" during her latest appearance on The Late Show with Stephen Colbert, the actress noted, "Everybody would laugh but me," adding, "It drove him mad, actually, because I would never laugh ever." Robin Williams' jokes failed to amuse his costar Sally Field on the set of 'Mrs. Doubtfire.