Men With Mustaches: Are They a Do or a Don’t?

The Original: Clark Gable

Who knew ‘staches could be so classy?

Brad Pitt skews retro.

Nick Cannon’s vest matches the old-school vibe.

As for this man? Frankly, my dear, we do give a damn. Keep it neat, or shave it off.

The Original: John Lennon

This shaggy folk-rock look is back, but it’s hard to pull off such out-of-control facial hair.

Christian Bale is toeing the Do line, thanks to expert grooming.

Ditto Joe Manganiello.

But the guy in red is just too sloppy. Let it be? No, thanks.

The Original: Burt Reynolds

It was cool in the 1970s, which is why your dorky dad still has one.

We love Nick Offerman as Ron Swanson of "Parks and Recreation."