Buy one, get one - child.

Kids get lost at the mall all the time. Having called security, I was waiting with one weepy little boy when his mother came back into the store with an armful of shopping bags.

Two of those bags were from my store. Another was from KB Toys, and when seeing this, the boy burst into tears and had a tantrum because he didn't get to go pick out Legos. She had come into the store, made a purchase, went to another store, made a purchase, and then noticed she was minus one child.

Perhaps we've been wrong about the child leashes; they're actually used so the parent doesn't get away.