Heath McKenzie has never had nits, and never particularly wishes to. This is not to suggest he has anything against them. (Well, actually, he does. They're not nice and never to have anything to do with them suits him fine!)
On the other hand, Heath is a huge fan of cartoon nits. The uglier and itchier they are, the better. Oh, and he's also a best-selling illustrator, having drawn for numerous books, magazines, advertising campaigns and more, including Tristan Bancks' fantastic Dream Racers series.