The coffee you order can mirror your
personality. An observational study of
coffee drinkers showed that people
who drink black coffee were more likely
to be patient, stubborn purists, while
those who add cream and sugar were
more generous and comfort-seeking.
Iced coffee drinkers tended to be
spontaneous, childlike trendsetters,
decaf drinkers presented as obsessive,
health-conscious control freaks, and
most of the instant coffee drinkers
were laid-back procrastinators. Source Source 2
I am a laid-back procrastinator! I think this should take the place of MBTI as it’s far more rigorous and scientific. There are people who don’t drink coffee at all, so maybe we can do other studies based on tea or soft drinks.