From Scarlett Johansson's shag to Kate Walsh's bob, it's ugly out there.

We all have bad hair days, but some of these celebrities take it to a whole new level. We give them credit for being brave enough to sport completely unnatural hair colors and wacky haircuts -- but at the same time we wonder what they were thinking. Check out their worst hairstyles to date ... then think how much worse your hair could look next time you have a bad hair day. ...More