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.