Koha developers may be contrary enough that this wouldn't work, but still a fun idea:

https://github.com/codedance/Retaliation

Video here --

https://www.youtube.com/watch?v=1EGk2rvZe8A

Many possible applications :-)  Squirrel on your birdfeeder, child in the cookie jar, ...

Cab Vinton
Plaistow Public Library