I always use DTS demo disk 4 & 8 (DTS-ES) to demo LFE & surrounds to my guests. Beats opening every DVD and forwarding to the awesome LFE & surround scenes.
Demo disk 4:Haunting, AntZ, SPR
Disk 8: LOTR TTT, Pirates of the Carribean, Daredevil, Gangs of New York
Believe it or not, the loud LFE of these demo disks serve as my stress reliever when I am tired.
Specially the explosion in LOTR TTT wall breach scene! Grabe, my HT room & sofa shakes from this scene.
Also:
Blade 2 (DTS-ES) Club scene
Day After Tomorrow (Flooding scene)
AVP
Sky Captain