If you really want a clue about what life in a new company is going to be like, arrange to have your prospective boss take you to lunch, and let them drive. If they drive like a crazed lunatic, chances are good that they'll run their projects (and you) the same way.
Re: Biggest clue you don't want the job you're offered
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dws, you don't know how right you are. My company works very closely with a demolition company. The owner not only drives his car like a maniac (he did donuts on I93, one of the busiest highways in the state), but he also operates his machinery the same way. I saw him try to demolish a building that even I could have brought down safely and there were bricks flying everywhere. A couple of cars got hit and if humans weren't made with "dodging" capability, many people would have been whacked too.
I guess what I'm trying to say is, your test is an excellent one and not only because it points out the type of work environment. Many people would endure that environment if it meant making more money. But what they don't understand is that if the owner doesn't have the self-control to (drive a car|run a business) it won't matter how much money they make because the job won't be there for long.
The demolition company I mentioned above has actually gone under three times in the past decade. All due to litigation. The only reason why the owner is still in business is because he always has a "backup" company so that when his current company starts to go under fire he just transfers everything to the "backup" and dissolves the old company.
This is a more extreme example of what you're talking about, but whose to say there aren't other bosses like him?
Update: Due to several complaints, removed signature