Auto voltage sensing PSUs can be fun too
Back in the very early 2000s (I think) we had a bad batch of Fujitsu base units where the PSUs would randomly set themselves to 110V first thing in the morning. Which made for a rude awakening for the poor unfortunate on the opposite side of the desk as the usual 240V was applied to it at the press of the power button................the fuse went pop pretty loudly in a quiet office!