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dé·jà vu
/ˌdāZHä ˈvo͞o/
noun
a feeling of having already experienced the present situation.
except it isn't that; it isn't that simple, or straightforward, and if it was only that it wouldn't be the experience we know it to be. Routine and repetition creep through life in countless ways, noticed and missed, and we are not living in the waxing and waning of déjà vu; it is a unique experience, an oddity even among the familiarly familiar, and it is the familiarity itself that puts the feeling out of place.
Because it isn't just "i've experienced this before," but rather "i've experienced this before but i shouldn't be here again, or shouldn't be familiar yet". it is recognition stripped of context because the context you can define is at odds with that recognition; you have been here before, or maybe it is a memory out of time colliding with it's arrival from the wrong end.
follow it the wrong way and you will yourself fall out of time, slipped from grip on the past in a continuous path and unable to move or see a future yet to be when every other moment creeps with warning and eerie repeat.