“You may not belief that there are six errers in this short paragraph. Studi the paragraph carefuly. You can reed it as many times as necessary. Don’t give up too easily. See if you can find all of them.”
Write the previous paragraph on a slide or a flip chart and challenge participants to find all 6. Most participants will find five but few will ever find the sixth. The sixth is simply that there are only five errors (so it’s an error to say there are six). The exercise points out how we often think inflexibly and fail to consider all the options when problem solving.