I went out with the kids and DH stayed home and handed out candy. I could see my 4 year old telling the candy-giver what kind of candy he wanted. I try to tell him to just accept what they give him but most people don't seem to mind.
My hubby said the cutest was a very little girl who was shy and dressed as a fairy. He asked her what she wanted and she used her fairy wand to point to her candy bucket. It sounded just adorable!!!