@PotomacBob
A story begins:
You know what they say, "man plans and the gods laugh."
Is that an example of 2nd POV, since the author is talking to "you" (presumably the reader)?
If not, what is an example of 2nd POV?
I'm not sure what the technical term for your example is.
It could be an example of the second meaning of 'you' as defined in dictionaries, e.g. from OxD:
you
PRONOUN
2. [second person singular or plural Used to refer to any person in general.
'after a while, you get used to it'
'It's a more general thing, where you just get gradually drawn in to the centre of the whirlpool.'
'Please note that our general policy is go by the way you sign yourself in the body of the email.'
'Here is a simple calculator to show you some terms of a General Fibonacci Series.'
'Because of you, we go into the next General Election as the only party able to unite Britain.'
'Remember when the Internet was full of expensively generated content that cost you not a bean?'
'Generally in society you have the break up of the community and the rise of individualism.'
'As most of you will know, carp generally move around a lot less in winter than they do in summer.'
It doesn't feel like that to me. I think it's a rhetorical question addressed to unknown others. I'd write that like this, BTW:
You know what they say, 'man plans and the gods laugh'?
The most common use of second-person POV is instruction manuals. Imperative sentences, e.g. 'Do it this way', intrinsically use the second person.
I've only ever read one example of fiction which used 2POV. I edited drafts for the opening chapters of a sci-fi novel. The premise was that the consciousness of beings from one world could be implanted into the body and consciousness of a suitably matched individual in another world. The visitor was aware of every sensation and thought of the host. Their ability to influence the host was limited. The author used you to describe the actions and thoughts of both the visitor and the host, in much the same way as most stories do for the MC when using 1POV.
What can I say about that? How about I say I considered the author's effort both heroic and "heroic"? I did my best, and I applauded the author's willingness to experiment, but it wasn't really working for me and the author hasn't asked me to look at any more chapters.