I've seen a few places.

"the illusion of having previously experienced something actually being encountered for the first time."

∆

I believe in déjà vu. 

A test was done on about 300 people to see if they had any experience of such phenomena. 76 % of the test subjects admitted to having experienced it. But can you trust statistics? Not entirely, due to the fact that every experiment has errors.

I believe to a certain extent. A glitch in my reality is all it is (I've had a couple glitches lately). It's just one of those weird things...