The word squirrel is said to be notoriously difficult to pronounce in English – at least for non-native speakers. For many Germans it’s a dead give-away (BTW: I can pronounce squirrel and have never understood the difficulties others have with the word). There is a word in the German language that does exactly the same: it outs people as non-natives even if their spoken German is otherwise flawless: Eichhörnchen. Now guess what it means.
Above you see a squirrel doing a disappearing act. I could also say: Oben sehen Sie ein Eichhörnchen, wie es verschwindet.
The Ragtag Daily Prompt: Shibboleth