Freight shipping company still running on a custom AS400 application for dispatch. Time is stored as a 4-digit number, which means the nightside dispachers have their own mini Y2K bug to deal with every midnight.
On one hand, hooray for computer-enforced fucking-off every night. On the other hand, the only people who could fix an entry stuck in the system because of this were on dayside.
Apparently, this actually isn't uncommon in the industry, which I think is probably the worst part to me.
Hehe I was in global shipping IT, we had some ooooold Solaris systems that handled freight halting data flows. Windows Server 98 servers that handled data for very large shippers. Every daylight savings time change something would break.