Sprockets Sez:
THE FIRST WORD OF THE COMIC!
So, this may or may not be the only instance words show up in the comic. I really enjoy the lack of words and I love the practice of trying to convey ideas and emotions through simple observations using lines and color. I personally find it difficult to communicate with words, so I think that's another reason why this appeals to me so much. Less room for complications? Less 'why' and 'how' and it just... is.