I think it's easiest to teach by example. My dad didn't tell us to work hard we just saw how hard he worked. I know I have shortcomings - like a short fuse - but I've learned you can't come home from a long day of work and snap at the kids.
But it also became the experience or was the experience of the writers who were attracted to this kind of humor. They're all men or women who come from the same kind of experience in their own lives.
