Meat Switch

At a Brazilian Steakhouse, they give you a small object to place in front of you. If the green side is up, they'll keep offering you more meat. If it's red, they'll pass by you. This "Meat Switch" controls how much meat you ultimately get.

Bob, you still eating?
No, I'm stuffed.
Flip your Meat Switch to red then, so they stop bothering you.
Gotcha