Firstly, his 2007 MTV Movie award mini-advert:
Secondly, as posted by ladyjj over at hedergasm
The Trailer for Moving McAllister.
P.S. I went on the hunt for the MTV Will Ferrell/Sacha Cohen kiss. No luck as of yet. Trust me, It'll probably get posted within the next couple of days.
And if you missed the 2007 MTV movie awards, don't worry, they replay that thing like OCD football announcers. So, keep your eyes peeled, there will definitely be repeats throughout the week.
ETA: As provided by lynxx13 The Will/Sacha Makeout session from the MTV Movie awards clip.
Oh Holy Jesus.