Last Thursday, my second class fooled around a lot and didn't get very much done. As a result, I sent them home with homework, while the other two classes did not have it.
Friday, when it came time to switch classes, I spoke to that class before they came into my room.
I said, "Remember what happened yesterday. Do you want to have homework again tonight??"
Much to my surprise, most of them yelled, "YESSSSSS!!!"
They never cease to surprise me.