Doug Semler writes:

Well, I could pull out my Mensa card, but of course that doesn't show
anything, does it?

Given what many Mensa members are like, it is perhaps best not to show the
card. The organization is famous for attracting intelligent but socially
dysfunctional individuals. About 120 million people worldwide qualify for
Mensa, but only 70,000 have joined, and they are a self-selected group that is
not representative of intelligent people as a whole.