Watching movies with Ambilight is already kinda "fantastic" but if you want to impress your friends then use following concerts. It seems they were especially made to demonstrate the added value of owning an Ambilight:
I discovered live concerts are great to watch (and listen) and these ones are really fantastic with their light shows.
Schiller - Atemlos (Live)
Schiller - Colors
Schiller - Sonne
Schiller - Zeitreise
Maybe, you can share some of your favorite content with the community, too?