This fails on the empirical observation that any attempt to strap buttered toast to a cat results in the cat shooting across the room and climbing the curtains, the cat ends up claws out clinging to the ceiling, while the toast falls off and ends up buttered side down on the rug (Thus both conditions are satisfied).
Usually the cat also claws you to death enpassant on its way to the curtains.
Seriously people, theory is all very well, but at some point you have to consider the issues with practical experimental design (And anything involving a cat is problematic, they have an ancestral memory of that thing involving a box that may or may not have ended so badly for Bast)!
Regards, Dan.