2. Being able to break into a 24 hour data centre because the data centres building management just didnt give a shit. Turns out they had fired all their staff and were leaving the DC empty until they liquidated. We managed to get our kit and bail. But like physical security provided by a third party is ephemeral.
3. I used to lock my bike to my tool shelf. A thief came along and used my hacksaw from my toolshelf to break my bike lock and steal my bike. Thieves will use anything available, not just what I want them to use.
4. Had 2 console windows open. First to a Junos device on my desk. Second to a Junos core router. I reloaded one, and didnt realise I had reloaded the wrong one until we lost an entire state. Multitasking invites risk.
5. Customer had a huge failure. Kept insisting they would rebuild completely, but would routinely beg for just one more dodgy workaround just to keep them going. They never rebuilt. That network is perma fucked. Customer promises are worthless.
6. Much like 5. Customer got bought out by a larger firm. Began to raise new deployments by escalating to the after hours noc, pretending that new deployments were actually failed existing sites. We asked them to stop and they never did. If theres a large enough financial interest customers will just ignore contract and good practice to make the payday.