and put them in the art room across the hall.
When the first students walked in, they came right back out to the hall - "Miss Foyle, we have a problem!"
"What is that?" I asked (as innocently as possible).
Student: "Our chairs are gone."
Me: "You have no chairs?! Oh man, they must have moved the stacks yesterday when I switched your desks. Well, it looks like you'll have to stand until I can find them."
And so, they stood for the remainder of homeroom. "Just sit down," I told them, to which they replied, "We can't!" (Ha ha.) They would have continued to stand for all of advisory, but my coworker gave me away when the students were trying to relay our problem to him. He raised his eyebrows at me, and I couldn't keep it together. (Shucks.)
It was fun while it lasted. Harmless. Believable. Fun.