Sin City star Carla Gugino was freezing on the set of her new movie MR. Popper's Penguins - because her flightless co-stars couldn't perform if the temperature was over 40 degrees Fahrenheit (four degrees Celsius).
The actress admits the creatures were by far the fussiest co-stars she has ever worked with.
She explains, "They had their own habitat on our set in Brooklyn... They could not function properly over 40 degrees, so our set the entire time was 39 degrees... It was crazy.
"I'm not good with the cold... I'm from Florida. I'm very thin-blooded."