Lighten up? Why? Look at what he's advocating. Anarchy; sit where you want, whether you've paid for it or not. Give the crew the problem of sorting it out. I don't see it as clever or funny - if it helps, imagine this happening on your flight and having to sort it out.
The surprising thing (to me) is that he wants our advice as to how to achieve it. Clearly I'm just an old dinosaur, out of touch with what is going on: Don't worry, I'll retire one day soon and then you youngsters can enjoy this brave new world that you've just created for yourselves.
I'm sure that BA will have a sense of humour about this that is much better than mine, so you go right ahead and try it down to JNB. Give it your best shot and good luck. Do tell us all what a good laugh you all had when you get back won't you.