Re: what did you do to your motorized bicycle today?
Glad you did not go down roger!
And yes maintenance on coaster brakes is a must and frequent checks will avoid future problems.
One trick i use is to listen to my hubs using a stethoscope or even a screwdriver. I don't rely on this but it does help me hear if there is a problem or lack of grease between regular greasing and maintenance.
It takes a little practice but after time you can judge if you need to do further maintenance.