If somebody for some reason managed to convince me to come onboard as an employee, and I was asked nicely to leave after two weeks, I would begin the conversation with "That is unfortunate and unexpected, as I was looking forward to working with you guys. We're all businessmen here, so we know that there are certain reasonable expectations which one has with regards to employment offers. I shouldn't be telling you anything you don't already know when I say that this is highly irregular. It would not be irregular if I were, say, a consultant. If you want to retroactively treat our arrangement as a consulting arrangement, I'm amenable to that reclassification, because I like you and wish you to succeed. I will send you a copy of my standard Master Services Agreement and a Statement of Work for two weeks work. You will sign them, as written. I will then invoice you for my standard consulting rate, which is $60,000 for two weeks. You will pay it and we will part ways as friends."

And then I'd see where it took me from there.