Here's a very impressive way to deter robbers and it can be found in convenience stores, banks, or a post office in Japan. It is a ball that sits on the counter. You can't buy it, and nor should you touch it. This video explains why:
Yes you really don't want to touch it:
![](https://fooyoh.com/files/attach/images/3004/371/760/014/rob1.jpg)
Check it out: