We often had the Achan talk. Particularly if someone was disfellowshipped would people say they had felt that the congregation had lost God's spirit but now it had returned.
I guess I fell for the superstition, so when I no longer believed in the GB I thought I would test it by committing sins (particularly apostate speech but lots of little things like gambling or smoking from time to time) and see how long it would take for the Holy Spirit to uncover my wrongdoing. It took 10 years before I was disfellowshipped, so I feel I well and truly proven God's spirit was directing the elders.