Jimmy Fallon, host of The Tonight Show, asked Rahm Emanuel, Mayor of Chicago, to be one of his guests on the show. The Mayor responded to Fallon’s invite on his Twitter account by saying that he would only be a guest on the show if Fallon takes part in the Chicago Polar Plunge.

Emanuel agreed to participate in the Polar Plunge after challenging students in Chicago to read 2 million books over the course of the summer.

Chicago’s Polar Plunge is an annual event wherein participants take a dip into the freezing Lake Michigan to raise money for the Special Olympics.

On Wednesday night, Fallon told his audience that he would be taking part in the event, and that he has no idea what the Polar Plunge is. He then replied to Emanuel’s tweet by saying he’s in on the Polar Plunge with a hashtag #SwimmyFallon. On March 1, Fallon again tweeted saying that he got his ticket and he’s wearing a suit for the plunge. He then urged participants to show solidarity by wearing a necktie. Fallon also said that he is a man of his words and a man of his tweets.

Chicago Polar Plungers: I got my ticket. I’m coming. I’m wearing a suit. Wear a necktie (any color) to show solidarity. #PolarPlunge

— jimmy fallon (@jimmyfallon) March 1, 2014

On Sunday Morning, Fallon showed up in a suit, as he promised, and plunged into the 32-degree water in 10-degree weather with the Mayor. A few moments before the event started, Chicago firefighters went into the water and removed ice chunks in the area.

Fallon had a shocked expression on his face as he took the plunge. Both Fallon and Emanuel were completely soaked from head to toe as the crowds cheered while watching them.

After taking a dip in the cold Lake Michigan, Fallon posted on Instagram and Twitter with the caption “Officially PLUNGED!!!!!”

Officially PLUNGED!!!!! Thank you Chicago!!! Thank you Mayor. #polarplunge #coldneverbotheredmeanyway… http://t.co/TjiCzaMM2B

— jimmy fallon (@jimmyfallon) March 2, 2014

Sunday’s Chicago Polar Plunge had 3,200 people in attendance and just a little less than $1 million was raised for the Special Olympics, breaking the record for Chicago.

Jimmy Fallon, Chicago mayor take Polar Plunge http://t.co/ScI1Fpes5G pic.twitter.com/1A6850QJ3q

— WNDU (@WNDU) March 2, 2014

Image via Twitter