It's great fun, I also enjoy when I'm flying down the highway and one eye starts doing an impression of a kaleidoscope.
That is exactly how I describe mine too. I know first because I get a tiny blind spot and then it progresses to flashing silvery shapes like a kaleidscope that slowly takes over the whole vision from my left eye. Altogether, it takes about 30 minutes. Sometimes I get a headache later, sometimes I don't.