Bruce Willis's pre-fame jobs did serve as research for some of his notable screen roles, but he was never a cop.

The cinematic tough guy worked as a security guard at a nuclear power plant in his native New Jersey, a job he would play on film in "Unbreakable" (2000).

He also worked for a short time as a private investigator, not long before landing his star-making first role as private eye David Addison in the '80s romantic comedy series "Moonlighting" (he would play one again in the 1991 film "The Last Boy Scout").

He even worked for some time as a bartender, years before playing a long string of boozy loners (and working as a Seagram's pitchman in the '80s).

However, his most frequent on-screen job -- police officer -- is one he never held in real life.

Of course, the most notable example here is John McClane in the four "Die Hard" films. That is, four so far. A fifth -- reportedly to be titled "A Good Day to Die Hard" -- is currently in production, scheduled for release in February 2013.

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