Best Halloween Costume

On November 1st, dressed in normal clothes, I went outside to trick-or-treat; I rang on my neighbor's doorbell, and he opened the door. "What are you doing here?", asked he, while I responded, "Trick-or-Treat!". He told me that Halloween was yesterday, but nevertheless, out of curiosity, he asked, "What are you dressed up as?" I responded, "a procrastinator".