You Kill Me (2007)
2007, Dir. John Dahl
Context: Ben Kingsley plays Frank Falenczyk, a hitman for the Polish mafia, and an alcoholic. His alcoholism starts to get in the way of murdering people for money, so the Family sends him to dry out in San Francisco. Dave (Bill Pullman), was hired to make sure Frank cleans up his act, and arranges for his apartment, a job in a mortuary, and attendance at Alcoholics Anonymous. One night, Frank comes home to his apartment, but it's not empty...
Exegesis: I don't know about balling up socks or flossing, but not hiding booze is certainly Mormonesque. Again, this is a reference to the Mormon law of health, otherwise known as the Word of Wisdom. There are many parts of this law, but the ones that seem to get the most press are the proscriptions against alcohol, tobacco, tea, and coffee. These are likely the stand-outs, simply because one or more of these things are probably staples in the lives of most non-Mormons. The Word of Wisdom is particularly interesting, I think, insofar as it was revealed to the Prophet Joseph Smith in 1833, well before the global scientific community had reached a consensus regarding the injurious effects of some of the substances proscribed by the Word of Wisdom.
Bill Pullman talking about flossing and balling socks isn't exclusively Mormon per se, but coupled with the lack of alcohol, these traits fall in line with the prevailing Mormon stereotype of being neat, tidy, responsible, and generally strait-laced. For the purposes of many films and television shows, Mormons are essentially interchangeable squares and/or rubes. (For another example of this tendency to portray Mormons as honest, friendly and embarrassingly naïve, check out this clip from Frasier.)