The first teaser trailer for Jason Reitman's Up in the Airhas arrived online courtesy of Slashfilm (watch it after the jump), and while it doesn't knock my socks off, it definitely has that "Okay, it's time to turn our brains back on" feeling -- that familiar and satisfying post-summer thinking man's vibe. Ya know, the kind that comes at you with a teaser trailer that features a voiceover talking about life, family, responsibilities and all that other stuff. One thing the teaser has going for it is the fact that Reitman put it together himself (with a little help from his editor at Acme), with intentions of just debuting it online.

So not only do you get a piece of marketing that comes straight from the filmmaker (which makes it pure, honest and devoid of Kanye West remixes and product placement), but this is the only venue with which to watch this particular teaser. In the film, George Clooney stars as a guy whose job it is to travel around and help companies downsize. But when he meets and begins to adore the female equivalent of himself as he closes in on his goal of 10 million frequent flier miles, his own job is threatened and he soon must re-evaluate what's really most important in his life.

Up in the Air hits theaters on December 4. Check out the teaser trailer after the jump, and another clip right over here.