On January 1, 2000, while the world was busy panicking about Y2K, a completely different time-related bug was quietly lurking inside millions of Cisco routers — and it went off like clockwork two years later on New Year's Day 2002, taking down corporate networks, hospitals, and internet infrastructure worldwide. It turns out the Y2K party ended, but nobody told the firmware. This week we dig into the bug nobody warned you about, and why the real lesson isn't about computers — it's about what happens when engineers assume tomorrow will look exactly like today.