I was pleasantly surprised one evening, out with friends, as for some reason the entire group decided they ought to mutually verify on Signal. I'm not certain that "Very drunk people" are the best possible to perform the verification step in Signal, but it's certainly true that you'd have to be a very determined and skilled imposter to show up to somebody's birthday, drink and smoke for several hours in that company and then go through this elaborate verification ritual.

Over time such verification "decays". People buy a new phone, that sort of thing, but it was a healthy boost in one inexplicable moment.