Hot swap wheels
In the late 90s, we were completing the rollout of some new client-server systems. I had bought a big new server, with redundant everythings, including 4 hotswap power supplies, two of which were needed. he server wa s a huge beast and was on wheels. One day, fortunately just before going-live date, but the machine in full use by the developers, I decided to check something at the back, and wheeled the server forward. And all four power cables popped out.
After that, I bought locking power cables.
Yes, I was IT Manager at the time.
To complete my mea culpa, I did have a routine at that company, when having monthly one-to-ones with staff, of encouraging them to comment on me and my style, but it always felt a somewhat trite invitation, given the authoritarian nature of corporate workplace hierarchy. I meant it, though, and learnt plenty.