updated 03/02/2014 AT 12:00 PM ET
•originally published 03/02/2014 AT 12:30 PM ET
Live, from Lake Michigan, it’s Swimmy Fallon!
It was a frigid Oscar morning for Tonight Show host Jimmy Fallon who answered a challenge from Chicago Mayor Rahm Emanuel to take a dip in Lake Michigan to benefit the city’s Special Olympics.
Fallon, 39, had asked Emanuel to join him as a guest on his new NBC show, but the steely mayor, a former White House chief of staff and friend of President Barack Obama, threw down the gauntlet and agreed – only if the comedian would participate in the annual “Polar Plunge,” the Chicago Tribune reported.
With temps at 10 degrees Sunday and water temperatures at about 32 degrees, it was a test of courage for both men, but a challenge Fallon couldn’t pass up when Emanuel taunted him to “toughen up.”
Fallon RSVP’d Monday for the event on Twitter: “Okay @Rahm Emanuel. I’m in. Lake Michigan will have a New York fish this weekend #SwimmyFallon.”
Fallon later said he’d take his icy dip wearing a suit and tie, and encouraged his fans to “show solidarity by wearing a necktie. (I’m not telling you what else to wear.)”
The mayor, known for his spicy repartee, said no to the business attire.