If deja vu is a feeling that you've already seen something that you've never seen before, then what would be the opposite? The normal answer seems to be the feeling that something you should be familiar with is totally unfamiliar.

Normal, schmormal! Surely the opposite should be: a lack of feeling that you haven’t already seen something that you have seen before…

Ah, hope that helps to clarify this important quirk of the human condition, my fine Fong. Or should it be "haven't already seen nothing..."? Think I’ll go and lie down now.