A Shoe?

I get how things get left behind.  I know that I leave papers, gloves, even a hanger or 2 when I visit a parish for Confessions. I often hang up my Alb and Stole when I arrive at a rectory - before dinner, and then after confessions, I leave with the Alb and Stole in my hands - and I leave the hanger behind.
But really - a shoe!?! How does someone leave 1 shoe behind - I might comprehend how one could leave 2 shoes behind - you wore boots - and then changed into shoes at the church - that might be possible - but really, 1 shoe, I just don't get it! Maybe it was Cinderella!!!
There are many such items in our "lost and found" - waiting to return home! How is that for an Advent reflection!

Peace