Not sure how well the "Pavlov" thing works...
Hmm...while I see why you'd call it 'Pavlov's Box', I'm not sure it fits that well. For it to be anything like conditioning, wouldn't that suggest repetitions of the consequence? In this case, he hadn't experienced the cat jumping out and mauling him before, so he couldn't very well be conditioned not to touch the box. However, if this had happened more than once, it would have made more sense...still, not too bad.