Mr. Brooks (2007)

So, Costner is Brooks -- a happily-married "man of the year" serial killer with a split personality who's now dealing with 1) a nutty wannabe (Dane Cook) who witnessed one of the bloody art creations and 2) the possibility that his college-age daughter shares his hobby.

There may be a few too many things going on, but it's surprisingly watchable -- the split personality played by two actors worked well, and Dane Cook's not too horrible.

B