I used my pepper spray on unleashed aggressive dogs (years ago). An optimal use for pepper.
They didn't like it, and decided to be aggressive somewhere else.
You could always put on heavy clothing (and a helmet) and have the wife shoot you with it. Just for testing purposes. I know my wife would have been more than happy to help me out with such testing.

Probably best to only load 2-3 of those pepper balls (at one time). In case enthusiasm takes over.
Got squirrels? Now that might be real fun.
Co2 probably sounds like a pellet gun.