Happy π day, everyone!
When I was in school in Russia I learned a little poem to remember some of Pi's numbers. The principle was simple - count the number of letters in each word for a digit after 3:
Я знаю и помню прекрасно
Пи лишние знаки мне вовсе напрасны
(I know and remember well, Pi's extra digits are useless to me)
3.14159265358