roflz.
Mice dont last 5 seconds in my house, I get several come in every week as I leave my back door open during the day and my house backs onto fields. Luckily, I have two cats and provided the mices aren't running over my foot i'm totally cool about them now and can ignore them, safe in the knowledge they have only a few minutes left. The other great thing is I dont have to buy my cats toys, there's an ample supply just wandering in.
As for the case in question, well I always say if you have a weapon then sooner or later you are going to use it. This is why I preffer not to carry anything myself.