Place pieces of paper around the room to set up a 'pirates' games.
Pick someone who is going to be the pirate catching them.
They all have to use the paper sheets like stepping stones.
The aim of the game is to cross the room without being caught by the pirate.
Talk about how there is a safe zone, and then by logic a 'danger zone' where you can be caught or fall in! You are not safe until you are in the safe zone!