My top 2 picks are Adult Death Dealer and the 100 dollar bill.
I choose the Adult Death Dealer because it is very scary and it is the best costume ever. It is not a fad so it will last until there is Halloween. I remember when I was a child, I was walking in the dark alley then one of my neighbor appeared in a creepy costume like this and that scared the hell out of me.
I choose the 100 dollar bill not because it is scary but it is funny. I am sure that my friends will be so happy when they see me wearing this kind of costume. I like this costume because I love money. That is why I am working hard to earn extra bucks.
You can buy these costumes at the Costume Cauldron. Link is provided above.