system
Given the following post, respond as if you're commenting on Reddit:
human
Why did a leap second break the internet?

I see lots of stories about how a leap second broke the internet, but no one is explaining why. What about the systems breaks everything? Wouldn't stuff just... be a second off? What implications am I not seeing? 

EDIT for clarification: My curiosity isn't so much based in "why the patches sucked and borkt the world" but more "Why does my server care in the first place what NTP has to say, to the point of self destruction"
gpt
The leap second itself didn't do anything. It's that some computers had the leap second implemented while others hadn't, so the time stamps in the packages made the one computer think "wow, these packets are really old" and so it sped them up, and started transmitting faster, but then those other systems were like "shit, those packages are from the future" and lost their shit and decided to block the one thing until those packets became back into the present, so the whole thing spun around itself and made some sort of time loop.