Professional Habits Do Not Change

When you've been coding for so long that you start indexing real-world objects from zero. Normal people would call this the first step, but programmers know better—it's obviously step[0]. The contractor probably spent years debugging array out-of-bounds exceptions and now can't help but apply zero-indexing to everything they build. Just wait until they number the floors in their next apartment building: Ground, 1, 2... just to watch the mathematicians and Europeans lose their minds.