Above is a mildly amusing video seeking to 'raise consciousness' about people who have naturally bitchy expressions. This is a universal problem. For one thing, the British newspaper the Daily Mail quickly embraced the phenomenon, and who can argue with the World's Tabloid?
For more proof, look at this photograph, taken at a German automatic restaurant in 1965, taken from a historical article in Der Spiegel about automat restaurants:
The woman on the right has the archetypal German facial expression, which I call the 'suspicious grimace', or SG (misstrauische Grimasse in German). It's a look that says 'What the hell is he doing here? Why is he looking at me? Is he going to come up to me and fondle me or hit me or ask me for money? I wish he'd go away.' This is the default facial expression of all Germans over 30, especially middle-aged and older females. I see it at least 15-20 times on my 10-minute bike ride to work.
I could go out right now with a hidden camera to any German city and, within an hour, bring you at least 50 photographs of random strangers -- mostly older women -- with exactly this expression. In fact, I've often thought of doing just that, but you can get in trouble in Germany for using someone's image without their permission, so I haven't actually done this. Note that as with BRF, the SG is not necessarily a sign of bad temper. If you strike up a conversation with one of these people and defuse the initial assumption that all strangers are potential perverts or criminals, even the grumpiest-looking frump often proves to be quite pleasant.
What explains this national trait? Is it genetic? Is it because most Germans are more fearful and insecure (pdf) than many other nationalities? Is it a lingering national memory of totalitarian government? Is is a curdled form of the remote, serious facial expression considered to convey personal dignity and reserve? Your guess may well be as good as mine -- we'll see in comments.
If you want to see what Swedes do when they notice strangers paying attention to them, follow the jump.