We just participated in an activity which demonstrated the importance of thinking before speaking, in life and especially at the client site.
The interns were divided into groups and told to figure out a word that describes something they have in common. Once the team wrote the word on a piece of poster board, they were provided the additional instructions to outline the word in toothpaste. The final piece of instruction: the interns were asked to put the toothpaste back into the tube. This is nearly impossible! The interns were excellent sports and tried extremely hard, but learned an important lesson.