Demolition Man is a 1993 science fiction action film starring Sylvester Stallone as a police officer revived in a sanitised future society where swearing and aggression are tightly controlled. That contrast between politeness and violence helped the film stay popular as a cult favourite, and short dubbed lines circulate easily online. The German phrase sanfte Grüße fits that world perfectly, so the clip spread on soundboards as a polite but pointed greeting. It remains used because the formal tone works for sincere hellos and sarcastic replies alike.