What If?

Divide the class into brainstorming groups of about ten students each. Ask the students to come up with the most unique "what if" question and answer they can think of. (In other words, start with "what if" and finish with some unusual situation.) Here are some examples: What if people didn't need to sleep? What if we "elected" presidents by lottery? After the groups have settled on their particular questions and answers, have the class compare them and vote on the most creative.