I need some fake boobs for my bumper…

We were driving to school today, and a truck passed us with a set of fake balls swinging from the tow hitch. This was not the first time I’d seen fake, rubbery nuts on a car, but I am still completely bewildered by them. Who sees these things in a store and thinks, “hey, I’d love to have me some fake balls hanging off the back of my bumper!?” I’m fascinated – just what is going on in the minds of the men who do this? These particular balls were black, which I found interesting since the driver was white. Was there some sort of violent undertone to these balls? Or am I reading into this too much? Sadly, this remains a mystery to me…