I realized that “Mensa” didn’t contain enough numerals to be a phone number, and knew it must be understood that any future member would be able to figure out the next two digits in the sequence. I tried dialling MENSANE, MENSAIL, MENSAFE, and MENSAAB, but got three rebuffs and a fax tone.
From “How I Joined MENSA” by Steve Martin
I want to believe, that the eligible people who join are mostly doing it because there’s no way anyone would join, so they just want to know what tf is going on, then discover that everyone there had the same reason, then they go for a pint to talk how stupid and comical it is.