Jennifer Morrison revealed an unexpected secret from the set of "Once Upon a Time." In doing so, she created a possible fun new game for viewers. Apparently, she and series co-star Ginnifer Goodwin have come up with a unique way to stay warm on the cold Vancouver set.

They use warmers called "Hotshots." Only the women don't always use them on their hands. Instead, they put them anywhere they can hide them -- and they do mean anywhere!

"Ginnifer Goodwin came to me one day and she goes, ‘I’ve discovered a new way to stay warm,'" Morison said. She went on to explain, "As long as you’re wearing underwear and tights, you can find a special spot so that it’s not touching your skin and it keeps you very warm."

There is a hazard to this technique, though. "There are times where all of a sudden they get really hot and it doesn’t matter, like, if we’re in a take. It doesn’t matter if we’re talking. Like, you’re getting that Hotshot out of your pants as fast as possible," she said.

So viewers can now try and guess when Goodwin and Morrison are sporting their discreet Hotshots on-screen, as well as when they might be getting too hot to handle.

Fans of "Once Upon a Time" can look forward to a potential expansion of the brand. ABC has ordered a possible "Wonderland"-based spinoff series. For now, though, they can catch Jennifer Morrison on "Once Upon a Time," Sundays at 8 p.m. ET on ABC. "Jimmy Kimmel Live" airs on the same network, every weeknight at 11:35 p.m. ET.

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