Not recent, but was pretty spectacular.
I was moving systems from a local server room to a campus data center. There were several rack servers, disk enclosures, and one desktop PC sitting on a shelf. The move was split into several stages, to move the groups of servers configured as clusters together and minimize downtime.
The move was rather uneventful: remove the boxes from the old rack, install in the new one, connect power and network and reconfigure IPs on public interfaces, and move on to the next batch.
The PC was moved as the last machine. When everything was almost ready, I plugged in the power cable into the PDU... only to be greeted with a loud bang, bright flash, and a cloud of smoke shooting out of the power supply.
It turned out that the PDUs in the new rack were connected to 208V power rails, and nobody bothered mentioning it to me. The old rack had the "plain old" 120V, and the desktop PC was one only machine which had a manual switch selecting line voltage.
To my surprise, nobody came to see what was going on. Was it so common there, that they got used to the sound of exploding caps in power supplies?