Very Superstitious - The Writing's on the Shoe

Are you superstitious? I'm quite the opposite. I love 'unlucky' things, in fact, they're my good luck charms. This morning I put on a new pair of shoes (that's a lucky day right there) and noticed my favorite number 13 written in pen on the bottom. I didn't do it, the hubby didn't do it, so where did it come from?? A sign from above I'm about to get lucky? Perhaps...