...that's funny. My cat Joe only does this when he is not impressed with his food. He has a slightly annoyed expression (the 'ol ears slightly back look) while he obsessively tries to bury it - just like he would other things

Maresche, I have never heard of cats burying food for later. Dogs, yes but then dogs and cats have very different dietry requirements and behavioural patterns. I'm not saying I don't believe you but it would surprise me.