Think about it - what would be the significance of a black van? If somebody was stalking you wouldn't they use something less cliché, like a silver minivan? Unless you were being stalked by the three stooges, of course.
It is the NSA. Since 9-11 secret spying programs have been authenticated by the president to observe seemingly ordinary Americans. I suggest approaching the van and demaning answers from them.. or run away
its the cia, they watch normal people so they can later experiment on them in area 51 with the aliens they breed there lol
You must have a stalker
'Cause they are bought and sold.