That's definitely a typical scenario, and I see what you're getting at. However, there's a huge difference between me and this "Billy Bob" character you're talking about.
1.) I/we aren't in that deep to where there's no feasible way to turn things around.
2.) Heat has no effect on the quality of my work. Every occupation I've held over the last decade has either been outside work year-around, or inside a manufacturing facility that was at a constant 110 degrees for 8 hours a day, 5 days a week.
3.) If and when I "fall off the horse", I don't put it back in the stable or sell it to someone who can ride it better than me. I figure out why I fell, analyze and correct whatever mistake was made, and get back in the saddle with more confidence that I'll have a better ride from now on.
When I set out to do something, I do it. Quitting is not an option.