The aerodynamics of an open top box at speed

[Gone in 60]

I have to think that the air passing over me, as the rider, must create a swirling motion that results in a back-current that is pushing up at that spot.

Sort of like my hatchback, which has a large spoiler on the back. If I drive through dust, it will stick to the back window.

Most likely it's the law of nature that is just trying to embarrass me, as you say.