Source: https://www.hpe.com/us/en/insights/articles/the-linux-commands-you-should-never-use-1712.html

The classic rm -rf / is there, along with accidental dd‘ing or mkfs‘ing the wrong disk (I’ve done that before), but the lesser known fork bombs and moving to /dev/null are in there (I often redirect output to /dev/null, but not moved files into there. That’s an interesting way of getting rid of files.