Lost shoes........

So in the last few days while running errands I have seen one shoe lying on the middle of the highway several times. Where's it's mate, and more importantly, how does one go about losing A shoe in the middle of the highway? They weren't dirty old shoes either, they were relatively new looking. It just disturbed me.... I have never been in a situation were losing a shoe out of the car on on the highway was even a possibility. I guess I just really want to know how one does that. Then I can stop thinking about it........... Cause I'm pretty sure that if I, by some freak incident, lost one of my beloved shoes out of the car onto the highway..... (see why I don;t get how it happens? It's such a big feat to accomplish).....I'm going back for it!!! I'm just saying that's my shoe man....."My Shoe!!!" ---- if any of you get what that line is from ie "My shoe" then you are totally cool!!