Terrible mother.

[Ladybugzcrunch]

To kill a mouse- just take it by the base of the tail and swing into a hard surface. It should kill it INSTANTLY. You'll know by it urinating.

Or you could just hold its head against a table with a pen (I use a paint can opener) and yank its tail. It will break its neck and you will not have to bash its brains out. Kinda brutal I think to mash it to pieces when there are much cleaner methods.