Help me american friends!

Hello. Im a dude in norway who has trouble finding out what i can dress up as on halloween (probably wrong spelling).. little tradition for this shait in my country and i kind of wondered if I could get some inspiration from our american brothers and sisters? Ill dress up as the top voted for if its physically possible and it gets more than 20 american votes. The dog in the picture is a very smart pup whom i have the pleasure babysitting for once in a while.