I would say that the high one *can* be a totally natural movement and a surprise and not the follower's choice: and therefore I think that (if you are going to do it at all) it *should* be. The reason I believe it *can* be, is that I once kicked my own bottom with a successfully-led high boleo, and I actually cannot kick my own bottom on purpose and unaided, even if I try. The reason I believe that because it *can* be natural, it therefore *should* be (if you are going to do it at all) is that otherwise you have to switch all sorts of thinking on and off and that is very distracting and destroys the overall logic and integrity of the dance and prevents you doing other things. I don't think faking makes sense in tango, for reasons of technique and aesthetics. But you may not agree that this follows. I also generally think that nearly all the ones I see on the floor (aside from being a bad idea in other ways) are fake, because it's really not at all easy to lead high ones successfully and it is also not common for the follower to be in exactly the right place physically - in any sense.