While word already broke that Mayor Bloomberg might channel Broadway's newest hero, Spider-Man, for the annual Inner Circle charity dinner, Hizzoner decided to also team with a long-running Broadway favorite. Bloomberg hopped into some disco-era clothing to boogie with the dancing queens of Mamma Mia! Last year Bloomberg spread peace and love with the Hair tribe, but this year's audience was lucky to catch him let out his inner-ABBA fan. Take a look as the mayor gets down with the Dynamos themselves: Lisa Brescia, Judy McLane and Jennifer Perry.