By Anthony Breznican
Updated September 08, 2013 at 09:41 PM EDT
Caitlin Cronenberg

The F-Word

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What part of making The F Word did Daniel Radcliffe and Zoe Kazan enjoy the most?

Getting naked.

That was their answer to a question from an audience member after the romantic-comedy screened Saturday at the Toronto International Film Festival.

The two actors, who star as friends (that’s the “F” word in question) who are hiding a mutual attraction for each other, answered without hesitation.

“I was surprised by how delightful it was to skinny dip in Lake Ontario,” Kazan said. “We had a terribly cold night on either side of that and then we just, like, chanced into actually a beautiful night.”

Mackenzie Davis and Adam Driver play a married couple in the film, and also doffed their clothes to dive into the lake. “I got to watch Mackenzie and Adam skinny dip, which was also really enjoyable,” Kazan teased. “That was more fun than I thought it would be.

“That’s the only time I’ve ever gone skinny dipping,” she added. “Legally.”

Radcliffe tried to think of a different favorite moment, but ultimately conceded: “I’m going to be boring and say skinny-dipping. We really braced ourselves, thinking it was going to be horrible and we ended up really having fun.”

Today, they were shocked to learn at a press conference for the movie how polluted locals say the lake actually is.

“Can I just speak up on this? No one told us — it’s poisonous?” said Kazan. “No one told us that we would get syphilis and gonorrhea from going into Lake Ontario.”

“But Zoe, we had syphilis and gonorrhea medication available as soon as you got out,” said screenwriter Elan Mastai. “I don’t know what you’re complaining about.”

“I’d already had it, It was fine. ” she responded. “It was actually lovely. I’m so glad to know after the fact that I had been poisoned. I’m so glad I didn’t know before we ran in.”

“I’m literally finding out now,” said Radcliffe.

“Really? Right now? Let me tell you, do you know the Gowanus Canal in Brooklyn?” Kazan asked him.

“No,” Radcliffe said.

“All right. Think of a toxic waste dump….”

“Okay. I’m thinking of it.”

“That’s what we were in.”

“Oh, right. It was very pleasant for that,” said Radcliffe.

“That’s why it was so warm,” Kazan said. “Nuclear reaction.”

“We were told it was going to be very, very cold. We were kind of dreading it, but we lucked out on quite a warm night,” Radcliffe said. “But now in retrospect I’m angry, because of the poison.”

“Mackenzie and Adam went in first, which definitely –at least – brought my courage up. Just knowing we couldn’t puss out after that.”

“I would just like to say, as somebody who lives in Toronto, I have to defend Lake Ontario,” said Mastai. “I’ve gone swimming in Lake Ontario. The e-coli count, it’s not that high. You might grow a sixth toe, but you won’t grow a seventh, eighth, or ninth. And people never get tails anymore. So … I just want to say it’s actually a lot cleaner than you think. We didn’t put you in any serious danger. It’s more of a long-term thing. Like, you won’t actually find out what happened to you for like 25 years.”

“Right. In 20 years, I will suddenly be a man,” said Kazan.

“And my grandchildren will turn out wrong? Fine,” Radcliffe said. “The reason we’re [joking] is everyone is going, ‘You did that? You’re crazy?’ It’s not just us Ontario bashing.”

Episode Recaps

The F-Word

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