The title of the thread indicates the bass in movies, not necessarily on DVD. So . . . I'll nominate Hot Fuzz, which I recently watched on Rogers On Demand High Definition. The picture is, of course, HD, but the sound is plain ol' Dolby Digital 5.1. So I'm sure it's very similar to what's on the DVD.
The use of surrounds is phenomenal. But even more impressive is the bass. The most mundane moments will have deep bass effects, to lend a sense of gravity to them (sort of the point of the flick, really), and they're deep. So deep and so loud that the voice coil on my (level matched) subwoofer was, as Athena told me, "slowly being destroyed".
Hot Fuzz. Serious, serious bass.
cheers,
supervij
EDIT: I just realized that I paraphrased the review of the HD DVD of this movie from DVDFile.com! I guess the review was still in my head -- I had read it again just a couple days ago after I'd been thinking about the movie. Sorry for the incredibly-close-to-plagairism bits in there; still quite accurate, though.