Most programming languages have stuck with array/list/string indexing starting at zero.
So you access the first item like this:
first = items
And loop over items like this:
i = 1 while i < 4: print(items[i]) i += 1
Which prints out the 2nd to 4th items (inclusive).
This is hardly intuitive and I even ran that code to be sure what that loop actually printed.
We can thank low level languages like C for this.
There have been a few languages that have seen the light and moved to one-based indexing, like Lua. Unfortunately, my current favourites (Python and CoffeeScript) have stuck with the crowd.
I cannot see this changing any time soon, so I decided to have this rant to show that at least one person still has hope.