Bad guys have bad hair.
I never really thought about this until BoingBoing linked this great article from The Awl, which features a ton of pictures from various movies, all of whom have bad guys with bad hair. There’s even a neat characterization guide to which bad guys wear which kind of bad hair.
I thought, immediately, of this:
He hits the Eerily Unnatural Dye Job and the Dorky Lackey.
Of course, in real life it’s not always so easy to tell the good guys from the bad guys, or the good hair from the bad hair.