Rahm Emanuel's Polar Plunge strategy is pretty straightforward.
"I'm not staying very long," the Chicago mayor said Friday. "This is not where I'm doing my lap swimming as I did this morning. In. Out. Dry off."
Emanuel joins "Tonight Show" host Jimmy Fallon on Sunday morning at North Avenue Beach to plunge into frigid Lake Michigan waters to support the Special Olympics. Emanuel challenged him to take the plunge in exchange for an appearance on Fallon's show.
"I give him a lot of credit for taking the challenge," Emanuel said.
Now faced with below-freezing temperatures and potential snowfall, Fallon perhaps didn't know exactly what he was getting himself into.
"Of course I said, 'Yeah, I'm in. Yeah, I'm in. Polar Plunge. That's me! Let's do it!'" Fallon said this week before noting, "I have no idea what the Polar Plunge is."
Once he figured it out ...
"It sounds like a nightmare," Fallon said. "You run into Lake Michigan and I'm going to jump in with the mayor, and it's freezing in Chicago right now."
It's all for a good cause, though, and Emanuel said he stands ready to hold up his end of the bargain.
"Once he jumps in, I will go on 'The Tonight Show,'" Emanuel said.
Fallon's parting gift? "I'm thinking of buying Jimmy Fallon a bag of ice so we can always remember this."