Oil paint resurrection?

[rgG]

It’s probably not really usable, when it gets to that state, but you can either stir the hell out of it, preferably with a drill attachment, or make sure the top is on really good and see if you can get them to shake it for you at your local HD paint counter. We would shake cans for people, IF the lid could be securely attached.
I would even tape those types of brought in cans, as you do not want to clean a paint shaker where the lid has come loose. Been there, done that.