The Man movie review & film summary (2005)
"The Man" is another one of those movies, like "Lethal Weapon 2," where the outsider finds himself in the dangerous world of cops and robbers. The cop this time is Derrick Vann, a hard-boiled Detroit ATF agent played by Samuel L. Jackson, and the outsider is Andy Fiddler (Eugene Levy), a dental supplies salesman from Wisconsin. Fiddler loves his product so much he chats up strangers about the glories of flossing.
Source: rogerebert.com