"Please may you"

[GurbangulyJones]

Where the heck is this coming from? Is it just me who is hearing this more frequently? "Please may I" is fine of course but what's wrong with "please would you?" or "please could you?"
It doesn't really make sense, I don't think, in that "may" is asking for permission - one could ask in the first or third person for permission but it just doesn't work in the second person.
Feel free to criticise the grammar or punctuation in my post, there's a lot of it and it's late at night but you get the general point I hope. Language evolves etc etc but I just can't quite square this one!

I worked with an Oxford professor who did this - probably still does. I tried to explain and it worked for a bit but then ‘may you’ restarted. Drove me mad.

It's because it's the subjunctive mood which is used for wishes, amongst other things. I suppose that in this sense 'may you sit on the carpet' or 'may you work from the other office today' aren't entirely wrong, as they convey the speaker's fervent desire that the thing should happen, but I doubt that that's what they meant to tell you. In any case prefacing it with 'please' makes no sense at all.

A woman once said that she didn't know when to say 'I' and when to say 'me'. I could have answered her on that one.

Similarly, I don't know when to use 'may' and when to use 'might'. A lesson is welcome.