Seriously? OMG! WTF?

Some of the Chicago Fire cast was a little bored as they waited to film a scene. Therefore, Jesse Spencer and Kara Killmer decided to take out their ukuleles and jam at their fake bar Molly’s.

Who knew they were so wild on the set, but they are. Then again, if you play with fire, you might want to play with something pretty tame the rest of the time.

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