Some fake Telekom workers showed up at my grandma's place in person recently, wearing uniforms and all, saying they need to "perform maintenance on the TV connection". Luckily, grandma's still super sharp, recognized that something was off, and just shouted "Peter, the TV people are here" into her flat, even though she was alone and Peter had died decades ago. They made some excuses and left immediately when they thought they were no longer just prying on a single brittle old lady.
Super proud of her, but also so scary to think that a bunch of asshole scammers were so close to just walking around in her flat.