I apologize if this was posted before because I haven't been on the forums for quite a long while...
I just watched "I AM LEGEND" last night. You know those THX ads that test the surround sound? This time it featured Horton and The Mayor of Whoville, scrambling around the screen (unfortunately, the movie theater messed up and this was intertwined with another ad at the same time) as Horton yells, "Can you hear that?! Can you hear that?!" if I recall. It ends with a tagline, "The audience is listening."
Keep an eye on THX.com (http://www.thx.com/cinema/trailers/new.html) for this short but amusing trailer. Their previous ad featured Shrek and Donkey from "Shrek".