At the beginning of this show, as a contest to gain Severide's third bedroom, Mouch offer's to draw straws, Otis (Brian Zvonecek) tries to persuade Cruz into a cinnamon eating challenge.
This is where one tries to eat a spoonful of ground cinnamon in under a minute.
Cheif Boden finds out about it, confronts Otis stating "By the way, Otis, The Cinnamon Challenge! Are You out of your mind!? (Otis interrupts briefly, It's cool chief, we are going to have a paramedic standing by.) Boden: You are a Fire Fighter with the city of Chicago Promoting a Dangerous Stunt that has filled Emergency Rooms with Victims who were Stupid enough to try it!" Otis: Cinnamon Challenge, What Cinnamon Challenge? Boden: I didn't think so.