I like that last one. We do this game in US History called Bluff, and in it there are two teams, each team composed of one half the class. Our teacher directs one team, asks a question, and whoever knows the answer, thinks they know it, or wants to bluff it stands up. The opposite team chooses the person who they believe is bluffing (if there are any), and that person has to answer. Well, the situation goes like this:
Teacher: *Directing group 2* "What is such and such.."
Group 2(us): No one knows it, so no one stands. And if no one stands, the teacher directs it to the other group. Who in their right mind would want that? So someone on our team stood up and made up an answer.
Teacher: "Uh no." -1 for Group 2
It's not as funny as your jokes, John, but the situation fits perfectly with the last one.