Replicating trailers with LEGO is a great way to practice your stop motion animation skills without having to worry about the story. Instead you can focus on your animation skills, lighting and editing. And if you are good enough (and fast enough) you can get some good coverage in the blogosphere.
Check out this LEGO trailer for The Wolverine by Antonio Toscano:
Here are some other LEGO Stop motion trailers:
LEGO Star Trek: Into Darkness trailer by Antonio Toscano
LEGO Iron Man 3 trailer by Antonio Toscano
LEGO Man of Steel trailer by Antonio Toscano
LEGO Casino Royale opening sequence by Bricktease