Wall-E on BluRay. 1080p with 120 Hz frame creation on a 106" screen with a CGI movie is like a candy coated razor blade assault to the eyes. If you really want to demo something, CGI is the way to go. Real life FMV footage is bland even in 1080p and isn't going to express the full contrast and color range of your video setup, nor is it going to be anywhere near as sharp or smooth to demo the high resolution and frame rate.
It's my own setup and I'm still completely floored whenever I see that, esp the scene where he's holding onto the rocket and runs his hand through the blue glowy dust stuff against the pitch black backdrop of space.
Alternately, any colorful game on any game console that is producing native 1080p (true 1920x1080 framebuffer not just upscaled by the video converter chip) over HDMI with all scaling, processing, overscan, etc, turned off on the display (eg: 1 to 1 pixels from source to final display).