Let me begin with two confessions: 1) I think Zach Galifianakis is possibly the funniest man on the planet. 2) I thought "The Hangover" was overrated.

Let me begin with two confessions: 1) I think Zach Galifianakis is possibly the funniest man on the planet. 2) I thought "The Hangover" was overrated.

Don't get me wrong, it was funny, but Galifianakis seemed to be on a leash at times, and director Todd Phillips wasn't quite back to "Old School" form.

They rejoin forces in "Due Date," which turns out to be one of the funniest movies of the year thanks to the inspired teaming of Galifianakis and Robert Downey Jr.

Peter Highman (Downey) is a high-strung expectant father planning to travel home in plenty of time for the birth of his first child. An airport encounter with aspiring actor and lovable manchild Ethan Tremblay (Galifianakis) derails those plans.

So Peter and Ethan become unwitting partners on a cross-country road trip. Yes, this is pretty much a "Planes, Trains & Automobiles" rehash. There are worse movies to rip off.

While I'm not sure "Due Date" will be the breakout hit "The Hangover" was, I found it funnier, sweeter and generally better than Phillips' last comedy.

Downey's slow-boiling rage and Galifianakis' utter silliness are like peanut butter and chocolate. I hope they work together again soon.

If there's one knock on "Due Date," it's that too many of the best bits have been given away in the previews. Fortunately, some of the biggest laughs are too tasteless for the trailer.