This game is a short, fun, physical game to get people moving and laughing. It ideally works best with group sizes of around 20 people.
To begin this game, have everyone stand up and secretly identify one person in the group to be their 'best friend', and another different person to be their 'worst enemy'.
When you say 'go', each person should position themselves between their best friend and worst enemy - protecting their friend. People shouldn't obviously reveal whom is their best friend or worst enemy.
Expect people to move around and let them go for around 2-3 minutes.
Once that's done, you can include a different variation where you position your best friend between you and your enemy.