Back in 1995 I had a moment of massive intellectual insecurity and joined MENSA. There were about 30 of us who took the test. Keep in mind this was before email privacy & hygiene and the mailing list went out to all instead of BCC so we found out that everyone passed. Literally everyone.

I'm suspicious of the MENSA selection criteria. You can even join without taking the test by having an SAT score above a certain value. Dubious.

But then, why would anyone join a High IQ society? I did because I needed proof I was smart, and wanted to be around other smarties (my social circle was nill), but the people were just kinda average and boring.