I was thinking about the group who could look at a 2,000 year old coin from Syracuse and tell you whether or not it was an obvious fake, a probable fake, an ancient forgery, and the reasons why.
Or look at a photo from your basement and tell you - yeah, you're really going to need a plumber to come in and look at that.
Or chat about the dirty secrets behind their hobby. Graverobbing: OK never, OK sometimes [because reasons], or OK because we pretend it isn't happening [looking at you, Harlan Berk AMA]?
Or analyze whether your mushroom growing setup was contaminated or not. ("Gonna need a better photo, but that cake looks dry AF")
Some of the side conversations in Hobby Drama were also really interesting.
I also learned a lot from some of the city-specific subs. Why has that one Pub seem to have gotten shitty? Is that just me? No, it's because the owner died and his weird son took over and fired the old staff because they didn't like his politics.