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(ABC News) -- In the history of spectacular career flame-outs, it's hard to match A.J. Clemente's infamous first day f-bomb as a local news anchor.

(Yes, he was fired.)

While some career killers are clear and follow common sense, the workplace can be rife with hidden dos and don'ts.

There are lots of different ways to get fired, and sometimes you'll never know what you did wrong, said Cynthia Shapiro, a former human resources executive and the author of Corporate Confidential.

What's more, these secret no-nos can be behaviors people think are good, morally and professionally.

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