Guinness a Bottom Layer?... What is going on???

This blew my mind! John sent me an email saying that he was having problems with the layering tool he had just bought.  He said he was trying to layer Guinness over Miller Lite for a black and tan and it wasn't working.  I had never tried that combination so I picked up some Miller Lite and tried it.  Sure enough, the Guinness mixed into the Miller Lite almost immediately.  Then, on a whim, I tried layering the Miller Lite over the Guinness. This is the first time I'd tried layering something over the Guinness as I had assumed that the only liquid that would work would be something like Champagne.  Well guess what?... It worked and actually layered nicely. Unbelievable!

My next step, a week later, was to try a triple layer with Murphy's stout in a can as a middle layer.  As you can see it worked well too.

This turns my world upside down.  Aren't stouts (and especially Guinness) always supposed to be the top layer??  Not anymore.  

Note that there was a lot of foaming with the Guinness as I was pouring the Miller Lite over it.  Had to stop a few times to let the foam settle down before continuing with the Miller.

Let me know if you have any comments to this. Other than the obvious of how could I ruin a perfectly good stout... ;)