Jesse Spencer

Grease fires are a common occurrence for any firefighter, but the boys of Firehouse 51 get more than they bargained for on Tuesday's Chicago Fire (10/9c, NBC).

In this exclusive sneak peek, Casey (Jesse Spencer) and Herrmann (David Eigenberg) put out a kitchen fire caused by a pan of grease left unattended on the stove. Although Herrmann initially wonders what idiot would do that, the question quickly turns to where that idiot is.

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Check out this exclusive sneak peek to see the surprising place the team finds the culprit:

Chicago Fire airs Tuesdays at 10/9c on NBC.