So cool, never knew this existed:

Triboluminescence is an optical phenomenon in which light is generated when a material is mechanically pulled apart, ripped, scratched, crushed, or rubbed (see tribology). The phenomenon is not fully understood, but appears to be caused by the separation and reunification of static electrical charges.

https://en.wikipedia.org/wiki/Triboluminescence

You see: I always knew us lighting designers were somehow voodoo witch doctors and/or magicians!!!!!