When I reviewed the Bobcat Goldthwait directed comedy World’s Greatest Dad — which stars Robin Williams as a father who’s aggressively assholish son dies in a freak sexual accident — at Sundance this past year, I believe I said something along the lines of “blacker than black, morbid as all hell and as sick and twisted as possible.” It is also funny, thoughtful and honest about it’s twisted subject matter and Robin Williams delivers one hell of a funny performance. One his best in recent years.

So it brings me great pleasure that today we’ve received the red band trailer for the film, courtesy of the folks at Hulu. As you can see below, it brings quite a bit of the funny — but I will also point out that this doesn’t even scratch the surface of this film’s wealth of absurdity and wit. Check it out for yourself by clicking below.

World’s Greatest Dad, which also stars Daryl Sabara and Alexie Gilmore, hits theaters in limited release on August 21, 2009.

What do you think of the redband trailer for World’s Greatest Dad?