Stupidity

In a small supermarket away of the city a thief who aparent young try's to steal the money of the cash register, a girl, the dependent was very nerveus and scared, but the thief was nervous too, the girl think it was his first time...
The girl try to open the cash register, but she can't, the thief very nervous and woried about if the police came leaves his gun beethen him to try to open the cash register, bad luck for him because the girl toke the gun and kill him.