CareerBuilder.com writer

"You're fired!"

This isn't just Donald Trump's infamous catchphrase on "The Apprentice." Those are the two most feared words in our professional lexicon.

There are, of course, obvious times where people are fired for bad behavior or negligence. But what about those times when it's something far more subtle that casts a cloud of doom over your job?

by Patrick Erwin, CareerBuilder.com writer

According to the Bureau of Labor Statistics, jobs in the retail sector and in the corporate world make up some of the most popular jobs in America. If you're in a sea of cubicles, the biggest "dirty job" you may encounter is changing the ink on the printer. But there are hundreds of tough blue-collar jobs available, too.