[topdancing]

Knock out this set of buildings in London, and you can kiss the entirety of the UK offline/most of Europe won't recover: https://en.wikipedia.org/wiki/Telehouse_Europe

[inopinatus]

It took exactly one (1) spanning tree misconfiguration on a single BlackDiamond to cripple LINX for hours, a couple of decades ago.

Source: I was sitting next to the person who fixed it.