I always figured that you could never have too much "I'll use it sooner or later" stuff on the truck (switches & recepts (white and tan), screws, fittings, boxes, wire, different breakers, etc). I was always big on stopping by and seeing what the "real" problem was, so if I didn't have it, I just went and got it and charged for that time.
I can build anything you want if you draw a picture of it on the back of a big enough check.
There's no substitute for hard work....but that doesn't mean I'm going to give up trying to find one.
IAEI / CEI / C10
Certified Electrical Inspector