I just wanted to comment "Conspiracy over cock-up, always" on an answer, and got a popup "Contents can't contain that content".
I spent a long time trying to obfuscate the 'cock', only to discover that it was the other 'co..' word that was a no-no.
I can't quite believe this isn't a transient bug on my computer. The same comment works ok here on meta.
What's going on?