My students absolutely loved this short activity. The whole lesson can be done in as little as 20 minutes.
This lesson encourages students to be thinkers, reflective, risk-takers, and good communicators.
The lesson begins with a TED.com video (6 minutes, and the link is included) and continues with an activity and reflection for students.
The video really focuses on the concepts of community and communication, but other IB learner profiles can easily be found.
This is a perfect activity for those days when schedules are altered, or perhaps a beginning of the year, end of the year activity. Adaptations of this lesson could be done easily.