What to charge for an impromptu car photoshoot at a car show?

[vintagesnaps]

A photographer owns the rights to their photos. Best option seems to be to provide prints or lo-res copies/thumbnails for social media use.

If this guy just wanted a few pictures of his car, it seems like it could just be providing a few courtesy photos. If it gets to be more than that it could get into contracts, licensing usage, etc.

You just don't always know when you give someone photos where and how they'll be used. I feel like other than an occasional courtesy, photographers should get paid for their time and talent doing creative work (which can be hard to price).