I teach in a hands-on culinary classroom, and have found that doing a verbal "re-cap" at end of day can help reinforce what the students have learned, and gives all students in the class a chance to benefit from these experiences. I begin with "So, who leaned something today?" or "Who got their money's worth today?". I try to turn even the most amazing disasters into something we gain knowledge from, and to alleviate embarassment- as in "it's something we've all done (or will do)... burn the soup!". Then discuss how to take precautions or adjust techniques to avoid this in the future and, in doing so, broaden the discussion.