Trick or Treat! Who wants to be the person who no one wants to knock on their door for Halloween? Obviously you! Hey, you're reading this article.
Steps
Get a black bathrobe. This is very important. No one would take the Grim Reaper seriously if he/she/it wore pink. Now put on your robe. It'd be a smart idea to wear something under the robe.
Get skeletal face paint. Paint your face with it. And it has to look like a skull is your face.
Get a wooden broom handle and get a sheet of cardboard and cut out a scythe with it if you like the homemade kind of props. Or buy one at a Halloween store, those look much better but cost you money.
Get a hood for your robe. A cloak works nicely, as long as it is black. Or other stuff that makes you look like the Lord of Death.
Grab your bag and hit the streets.
Tips
Don't be too gory. No real severed heads.
Have fun.
Warnings
Try not to scare little kids
Be careful, some people may feel threatened by you if it is not Halloween.
Do not claim you are there to take someone's life. That would be bad.