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And numerous Fallons dotted the crowd, thanks to masks in his likeness given to attendees, strolling around the beach quarters, moving among warming tents.

When Emanuel heard Fallon wanted him to appear on the show he took over in February from longtime host Jay Leno, the mayor called the comedian and challenged him to join in the plunge.

Fallon joked Wednesday that he agreed to it before realizing what it actually entailed. He also said Emanuel told him he had to “toughen up” before Emanuel would appear on his show. The comedian’s followers egged him to do it with a #JimmyPlungeWithUs campaign on Twitter.