How I confused an Indian co-worker.
I noticed that his office desk was using a multi-outlet power strip connected to another one, and then one more after that, because the cable length was too short.
Me: pointing out that this is not allowed in our company.
Him: dafuq-look.
Me: yeah, electrical safety, we need to replace this. Gonna ask IT whether they have something (they did), replaced it.
Him: different dafuq-look.
Me: I guess that's the most German thing you've run into, right?
Him: uh, yes, but I can see the point. :)