I used to think being spontaneous implied not preparing or planing, just jumping into whatever it is you are trying to be spontaneous in without any forethought. And, sometimes that might work out wonderfully, but most of the time being spontaneous requires a lot of advance work. You have to be ready for the unexpected and that requires practice.
None of these photos are what the assignments I have done in the past few days were specifically about, but they were interesting moments as I was walking to and/or from whatever it was I was supposed to be photographing.
I was just wandering, watching and waiting, for something. When it happens you have to be ready.