No documented founder or formal establishment record has been identified. The observance emerged from early-2000s internet culture, spreading through email forwards, message boards, and later social media as a comedic outlet for workplace frustration. An early online listing dated it June 10 before October 23 became the recognized date, and wider discussion surfaced around 2009.
The myth of the pressure valve
The notion has a name: catharsis. The ancient Greeks used it for the emotional release of watching a tragedy, and in the late nineteenth century Sigmund Freud and Josef Breuer rebuilt it into a kind of plumbing. Anger, they suggested, builds like pressure in a pipe until it has to be let out. Hit something, shout, vent, and the gauge drops.
It is an intuitive picture, and it is the exact logic a "slap your coworker" day runs on. It is also the part that has quietly collapsed. The pipe, it turns out, does not behave like a pipe, and a century of plumbing metaphors has not survived contact with the lab bench.



