A letter in the Central Intelligence Agency’s declassified archives shows that in late 1959, the Agency received an unsolicited suggestion from a helpful citizen on how to best weaponize haberdashery. While there’s no record that the CIA ever followed through on the advice, or even responded to the letter, it apparently left enough of an impression to remain classified for the next 44 years.

The Central Intelligence Agency’s bag of tricks is a veritable a-to-z of dubious doodads. Here’s 26 of the strangest.