It's a computer programming thing. For Technical Reasons, the most natural way to describe a list of things inside a computer is starting with 0 -- *inside* the program, things almost always work that way. So some of us programmers sometimes forget that the rest of the world doesn't think like that, because the start-with-0 law is so ironclad in programming.

(Really, I *do* know that intellectually; I simply goofed. While it seems to have been taken otherwise, this poll was mostly intended as, "this was a mistake, wasn't it?")