Game to teach responsibility, friendship, and helping

This is a game we play in the gym from time to time, but could be played at home using any number of materials like books for example.
Here are the rules:
Children must walk around the gym with a beanbag balanced on their head.  If it should fall, they must freeze, and wait for a friend to help.  This means another child has to come over, bend down to pick up the dropped beanbag and place it back on top of their friend's head.  The danger is that should the helping child drop their OWN beanbag in the process, they too must freeze and wait for help.  There is a lot of polite language being used throughout the game like "help me please," and "thank you."  And, of course, helping behavior builds friendships, and leads to more good deeds.