This is actually a running joke I have with Mrs. Yakov. We go on long drives on occasion and this is one of the bits we do to pass the time (the other is Yoda calling sports radio to complain about the Mets. Yes, really). Anyway, couldn't resist the opportunity to bring it out of the world of our minds and onto the Intertubes. Good times.
The Iron Horse was suggested by Penny from NYC (hope your hands are growing back nicely) who noted that the Yankees may have actually believed Gehrig was Jewish when they signed him and that, further, Gehrig counted a mezuzah among his many lucky talismans.
Thanks for the suggestion, Penny!