VIDEO: Who's the Biggest Troublemaker in the Chicago Fire Cast?

Whenever there's trouble on the set of Chicago Fire, chances are one cast member in particular is to blame.

During a recent set visit, TVGuide.com spoke to several Chicago Fire stars about who's most likely to pull pranks on the set -- be it stealing someone else's food or, you know, accidentally setting a fire. The answers were disturbingly consistent, with all fingers pointing to David Eigenberg, who plays Christopher Herrmann.

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Even Eigenberg himself admitted he's the most disruptive cast member. "It's because I'm little" is his excuse for stealing his colleagues' lunches.

Check out the video above to see which other cast members get called out by their co-stars for things like excessive Backstreet Boys knowledge.

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