In a documentary on the history of the cold war, this gem:
Those of you that have been in school since calculators were invented likely recognize it read upside down as BOOBLESS. One of the few funny things you can write on a calculator in an effort to make school more fun for you and your buddies.
Pretty funny that they snuck that into a serious documentary.
You can watch the documentary – HERE
Someone even immortalized it in a tattoo: