What is a Lip Dub? It's a video clip where we see a group of people (usually colleagues) miming to a song. The concept was championed by Jakob Lodwick, the founder of Vimeo (an online video site), who took his inspiration from the very successful lip dub by Connected Ventures, an American marketing agency. Since then, scores of businesses, organizations, and schools have filmed their own lip dubs - to get people talking, to promote a cause, or just for fun!
See also:
the Office Lip Dub site