I've heard many ways.....
1. Place a ruler longways on the neck push down, then pull the tail and you will dislocate the spine.
2. Co2 chamber, using dry ice or baking soda and vinegar.
3. Use a screw driver, and dink it on the head to daze it, so it's unable to attack your snake.
4. use a screw driver and and hit it on the head intel dead.
5. Bash it on the head on the wall. (Not suggested, it could get messy.)
If none of those methods work for you looks like you need to T up the mouse and hit it with a golf driver =P..... Kidding kidding I would never do that!
-Payson!