A reminder to treat eating pizza with the adequate reverence and respect.
Getting Hut pizza is not a simple act. It shall be treated as a religious ceremony, and one would not take such a ceremony lightly. When one gets Hut pizza they may not eat it while standing or distracted; they must sit down and focus all their attention on the consumption of the miracle food. If you see someone not giving the adequate reverence to the act, say "Sit. Down. Hut." to remind them what they must do.
Joe: Yo, I'm running late; I'm gonna grab a slice of pizza and eat it on the train.
Frederick: Sit. Down. Hut.
Joe: You're right, I'm sorry.