A chair
a metal bowl
keys(preferably a lot of keys. If you can't find keys use something else noisy.)
a blindfold

Put the chair in the middle of a room with the bowl of keys under it. Have a scout blindfolded sit on the chair.

Have the scouts go around the scout on the chair about 8 feet away

The leader says, "A Thief is Coming." This lets the blindfolded scout know to be on alert.

The leader points to one scout in the circle, indicating he is to try and retrieve the keys.

If the blindfolded scout hears the thief approaching, he points to where he believes the thief to be. If he is correct, the thief is now "IT".

The leader can appoint more than one thief at a time if he wants.