Equipment: a blind fold (scarf or necker) and a water pistol

One person is “It” and sits in the middle of the circle with a blind fold.   In front of her, she has a bunch of keys, or something similar.  And in her hand, she has a water pistol.

The aim of the game is for one of the girls sat in the circle to creep into the centre and steal the keys.  The person who is “it” aims her pistol and fires as soon as she hears a noise.