Around 1999/2000 I worked at Universal Studios in Burbank. Shortly after I started working there in the networking group, a fellow employee asked me to reset a

Around 1999/2000 I worked at Universal Studios in Burbank. Shortly after I started working there in the networking group, a fellow employee asked me to reset a port on the core token ring switch. Being a helpful type, I clicked "disable" on the network management tool for the port and promptly everyone lost connectivity. To everything. A quick walk over to the NOC confirmed that yes, the entire campus was down, as well as a few satellite campuses. I explained what I had done (which was met with incredulity, I mean, surely I had fucked something up and didn't just disable the described port).. After the longest five minutes of my life, the network came back alive. And sure enough, only the port that I had disabled was disabled. After some troubleshooting with the vendor, it was determined that there was a software bug in the switch firmware. If the device was under heavy load, disabling a port caused the switch to reboot. So that's how I took down the entire Universal Studios corporate network.