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
Thinking one step further: Even if I somehow got into MENSA (unlikely), I can’t imagine ever saying, “I see you have a MENSA discount…” ugh.
If there’s any discounts they probably take the form of a link on a website that gets you 10% off (clicking the link installs a cookie that increases your prices on that website by 10%)