Pergamon, keychains and Pavlovian reflexes
When visiting the Museum of Islamic Art in Berlin, I was playing with my (metallic) keychain. A worker there found me (“AHAAA, it was YOU!") and told me this charming story:
Their boss has a similar metallic keychain, he also loves to play with it, and that the chain’s sound makes most museum workers extremely worried. And that I kept the guy tense throughout most of the eight and ninth century.