Actual conversation between myself and a woman selling chocolates in a store in Hamburg.
I hand the woman my credit card, and smile.
She looks at credit card and says, (in very strong German accent in a strong loud voice)
"I see you are an American!"
me "yyyeeesssss?"
"I know this as you have a flyer credit card from an American airline, I am going to speak to you in English so you will know that Germans are friendly and like the Americans. At least no matter what others say, I like Americans. So even if the other Germans not like Americans you can say that at least one German was nice and did not try to hurt of trick you in any way. When you go back home you will say that Germans are nice, YES?"
After I wet my pants, I spent the rest of the time looking for the Germans that hated Americans and were waiting to trick or hurt me.