Obvious observing

Divide group into pairs and have them sit or stand facing each other. Then ask them to observe their partner focusing on details, clothing, jewelry and appearance, etc. After a few minutes observing they both turn their backs to each other and make three changes in personal appearance (change hair, move a ring to a different finger, unbutton a sleeve etc.) Partners then turn and face each other again trying to identify the changes.

Repeat this process with different partners and different numbers of changes with more or less.