Well, Ruben is a person and Reuben is a sammich. I can't do chocolate these days, and I'm not a big pastrami fan.
Yup. Picky, picky.
Just in case anyone's interested (and I suspect none of you are, but that's never stopped me before and it won't stop me now), in book publishing parlance, front matter is anything that comes before the actual text--title page, copyright page, contents, foreword, preface, etc.--and back matter is anything that comes after the actual text--appendix, index, etc.
BTW, Ruben is mighty fine in the back matter department.