What's Matt Doing With His Toothbrush?

We all know Matt McConaughey is a bit eccentric and Friday was no different. The straggly bearded actor made his way out of his Malibu house with a toothbrush in his mouth and proceeded to brush them (sans water) as he made his way through LA.

But it wasn't so much the fact that he brushed his pearly whites while driving (hey -- we've all done it) but more importantly the way in which he performed the cleaning act.

Take a look and judge for yourself.