I remember one time serving as HoS on Red Dwarf.
One time, I was paying attention to security systems, looking around the station for any suspicious activity. Someone got hurt, and was sent to sick bay to be taken care of, and I investigated. I was convinced the guy was hurt badly and needed medical attention. Little did I know, I was conned to believe things were okay, whereas in truth, the guy patching up the injured one was actually a traitor, and I was told off successfully. I went back to perusing the halls, and then out of nowhere, I heard a series of loud bangs, and next thing I knew, I saw a demonic giant red hole ripping me away from my console and the rest of the station apart.
The guy that was being patched up, he was hurt fighting the traitor, and was loaded with meds to prevent him from revealing the traitorous nature of the guy "helping him". It didn't help that the cameras can't pick up on sound, and I had to regularly check up on them to make sure nothing was too fishy. I was apparently too gullible as HoS, but I did follow protocol to the letter. I had to pat myself on the back for that.
What happened was that they successfully generated the power source, the traitor showed his true nature to the assistant engineer; he changed his job to doctor behind my back and without my notice he was a had engineer earlier, and conned em easily. He went back to the engineering bay and sabotaged the reactor, made it crit, and turn into an out-of-control black hole.