Yesterday at the end of my morning class session, I did prize basket drawing as I usually do on Fridays. I have a little plastic bucket that the kids put blue tickets that they have earned into, and I draw out 4 or 5 names for pencils and prizes.
As the kids were running up to throw their tickets into the bucket, I said, "Time to play the probability game! Let's see who's most likely and least likely to win!" Pleased with myself for referencing a topic we had covered right before break.
I then asked, "Who would be IMPOSSIBLE for me to choose?" -- thinking that good responses might include the principal, President Obama, Hannah Montana, etc, since they would never have any tickets in the bucket.
Instead, the kids yelled in unison the name of one of the kids in the class. A kid who, in turn, grinned sheepishly and said, "Oh yeah, I don't have any tickets in there."
Hey, he doesn't earn prizes, but at least he understands the concept of impossible.