Shoe mystery solved... read on:

So, my husband and I finally found out how random shoes make their way onto our streets, parking lots, grocery isles, etc. We were walking accross a local parking lot recently when we spotted a gentleman inspecting his shoe in the middle of the parking lot, right in the path of cars. So we must assume that had a car come, he may have had to jump to the side quickly whilst his shoe died a painful death under the wheels of an oncoming car. Who stops in the middle of the road to inspect their shoe anyway????

In addition to this revelation, I recently heard a conversation on a local radio station, where one disc jockey was upset over the loss of one of her brand new tennis shoes. It seems she put her shoes on top of her car after exiting her gym... and drove off! She only drove accross the street to the store, but when back tracking, her shoe was nowhere to be found. She re-traced her route immediately upon arriving at the store, but her other shoe was already lost.... so there you go!

I always thought it was like someone was hanging their feet out the window of a car and all of a sudden "hey, there goes my shoe".

Who knows.... please let me know if you have a better explanation.