I think you're joking, but I'm not sure. I work in trading, and I've been on the receiving end of that phone call. As I recall, it was around 9PM in the US, my work phone rang and could see from the caller ID that it was from our London office. There were no greetings, first words I hear were "We're missing over a billion dollars. You need to find it...NOW."

When I received that call, it was in the middle of the 2008 financial crisis. The daily PnL swings were wild, and it wasn't always clear on the cause. FX volatility was insane. We did all of our PNL reporting in USD, but held a lot of foreign assets.

There was no malfeasance; I'd just taken ownership of the system a week or two before, and a nightly job had silently failed. Perl job on Windows, extracting data from a 3rd party trading system that wasn't built w/ integrations in mind, feeding it into in-house systems. It was a very flimsy house of cards. A gentle breeze in the night would knock it over. Rewrote the integration in Python, hooked everything up into our monitored job scheduler. Had to do some janky UI automations in Python until we got the vendor to add a proper CLI-based reporting mechanisms. It was a "fun" ride, but I eventually got my evenings back. Did cause the end of a relationship, though, so there's that.