A giant tarantula that, by her own admission, actually knocked over the jar she originally placed it in.
That being said, Nicole Kidman is an Australian and these people literally live among the most dangerous creatures on the planet. Kidman was on the big red couch with Graham Norton last night and the story came up of her recent foray into Instagram - or the place where she keeps her videos of catching stuff.
"I put it in the jar, and then it knocked the jar over. Very, very strong. But I'm Australian, we grow up with spiders." That's fair, but IT'S A TARANTULA.
Anyway, here's Kidman's very chill explanation for it all. Take a look.