sudo rm -rf ./ and sudo rm -rf . are, as far as I know, the same command. Did you mean that you dropped the . and ran sudo rm -rf /?

Fortunately for me, this never happened to me, but I have gotten pretty close to running rm -rf ~ after mistakenly creating a directory caller ~…

How is this the first time I hear about mangoWC?

…but how should I interpret your passive aggressiveness if I should interpret your use of punctuation as no more than an effort to communicate clearly?