Went to Wanted a couple days back, and saw the R-Rated trailer for the new Will Ferrell movie...got A LOT of laughs from the crowd, more-so than usual. I think it was mainly from the shock value of the restricted trailer, but regardless it looks like this could be a good mix of Will Ferrell's typical humor with some edge thrown in.
http://www.youtube.com/watch?v=QBPVnr4CYKw
(Didn't see anything on this movie inparticular, don't kill me if the search engine failed me.)