This YouTube video that I found combines several elements that are special to me: black & white photography, noir movies, odd angles, reference (detective) work, libraries and a big dash of humour. What fun! Thanks to Nick and his cast and crew for demonstrating how not to conduct a reference interview!
Library Mystery Tour
Last year a useful webpage was created listing examples of YouTube applications in libraries: YouTube and Libraries
Investigate the Possibilites (another noir film!) is a clever way to introduce the library. Political correctors beware!
I've taken to using YouTube for researching music that I'm unfamiliar with. You can check out the latest album by a new or favourite artist/group before you buy. I notice a lot of the online book/music/dvd shops, not just amazon, provide clips like these, too. Embedded video is everywhere these days.