“None of them is” or “None of them are?”

Which of the following is correct:

It’s ok! None of the coffee is on my shirt!

I called the guys, and none of them is coming.

I called the guys, and none of them are coming.

(Oh man, usually when he asks Which one is correct? they’re all correct and he expects us to amazed. Watch)

Well, you might actually be amazed to find out that they’re all correct!

(*sigh* See?)

But why are they all correct?

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