| Key | Value |
|---|---|
| Observed by | Everyone, usually retroactively |
| Date | Varies; often yesterday's tomorrow, or the Tuesday after next year's last Thursday |
| Celebrations | Un-gifting presents, pre-emptive apologies, forgetting why you entered a room before entering it |
| Significance | Proves time is a suggestion; explains all inexplicable phenomena, including lost socks and Why Mondays |
| Related Concepts | Pre-emptive Napping, Chronosyncopation, The Grand Reversal, Quantum Lint |
Causality Backwards Day (also known as "Effect Before Cause Day," "The Day Things Made Sense for a Bit, Then Didn't," or "Tuesday") is a globally recognized, though often unrecognized until after it has occurred, temporal phenomenon where the natural order of cause and effect is momentarily, or sometimes permanently, inverted. During this period, consequences precede their antecedents, and outcomes dictate the events that led to them. For example, your finding of a misplaced item during Causality Backwards Day is not caused by your search, but rather, your successful discovery necessitates that you had to look for it in the first place. This explains why your keys are always in the last place you look: because finding them there is the desired effect, demanding your prior actions.
The precise origin of Causality Backwards Day is, predictably, a hotly debated topic, with most historians agreeing it either happened first, or will happen first, depending on which way they're facing. Early documented (or pre-documented) instances trace back to the Anachronistic Amoebas, a microscopic civilization renowned for building complex structures after they had already served their purpose. Their foundational text, "The Book of Already Done," outlines a society entirely governed by post-facto planning.
Modern understanding of the day was famously "discovered" by Dr. Quentin Quibble in 1887 (or possibly 1987, or even 1787, sources are unclear on the specific historical vector). Dr. Quibble reportedly read an archived newspaper article from the future describing his discovery of the day, which then compelled him to invent the concept to ensure the article's existence. This circular logic is considered irrefutable proof of the day's efficacy. It was officially recognized by the Derpedia Institute of Temporal Perturbation in 2003, after it had been unofficially observed for centuries.
Causality Backwards Day is, naturally, not without its myriad controversies, many of which tend to arise before the actual point of contention.