Who is the actor singing in the Snickers commercial?
You can look it up in the imdb at http://www.imdb.com. They have all the info on every movie/TV show you could ever want.
His name is Jack Mulcahey. He's also worked in soap operas and crime dramas. He's a left-handed guitar-player who actually plays a right-hand-string guitar upside-down. Some lefties learn to play that way; no one ever told them to restring the guitar for left-handed playing. That's why the chord fingerings he's using look so bizarre.