Personally, I never went do treat or treat nor did I dress up for Halloween as a kid. Neither my parents nor I were a big fan of the concept funnily enough.
I remember being a G block (yes, like a building block with the letter G, because my name starts with a G, not telling what it is though obviously),
Mario, an Angry Bird, and, not a childhood costume, but my latest Halloween costume 2 years ago was a lamp. I wore a lampshade on my head and had a light too.