How about running an 'explain game' ?
You come up with a short statement, and the entries are allowed one guess per day of a question that can be answered either yes, no, or irrelevant. The first one to pm you with the correct answer wins.
An example would be " Had it not been for the light, Miguel may have lived."
Typical questions would be, is Miguel human?, is Miguel an animal?, did Miguel die quickly?,... all questions that are answered with a yes, no or irrelevant.
I'll pm you the answer and it will become clear....
