There is no known correct way to eat pistachio nuts. Nevertheless, they are delicious. The pistachio nut must therefore be Nature’s way of teaching us self-control. If so, it doesn’t work.

Judith Martin (b. 1938) American author, journalist, etiquette expert [a.k.a. Miss Manners]
“Miss Manners,” syndicated column (1980-12-28)
    (Source)

Reprinted in Miss Manners’ Guide to Excruciatingly Correct Behavior, Part 11 "Answers to Questions Nobody Asked" (1983).