Last night, 'Hello Ladies' star Stephen Merchant, Joseph Gordon-Levitt and Jimmy Fallon squared off in a lip sync contest, and things quickly got out of hand.

What? You think watching people pretending to sing isn't entertaining, no matter how famous they are? Well, you've clearly never seen Stephen Merchant go in on 'Boom! Shake the Room,' the first (and best) performance given. It's definitely entertaining.

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