I’ve noticed some posts have a non-quote horizontal rule in them, and I’m guessing that it’s due to closing an unopened quote, with a [[sup][/sup]/quote] tag. Testing this theory:
Interesting, it seems that a [[sup][/sup]/code] tag will terminate a [[sup][/sup]quote] tag, but not vice-versa. Chalk it up to yet another oddity of vB.
For the record, it was I who discovered the utility of the [ /quote] tag as a horizontal rule, thanks to a mistake by Mr. Zambezi in Being a socialist in america, which I illustrated in post #587664. (The link should take you straight to the post.)
I use the technique often to separate portions of posts, or to block off quoted segements other than quotes from posters.