  I just heared a very amusing story from a collegue that travels a lot to the US. Last summer he went to visit some relatives in Pensylvania.
He met some other Dutch people on the plane that traveled with him from the airport to this little town. On their way, in a rental car, they accidently ignored a stop sign and got pulled over by a squad car. The officer asked his traveling companion, who was driving the car at that moment, for his drivers licence.
He also asked him why he thought he got pulled over. Since in Holland you can ignore a stop sign when there is no traffic coming, he answered that he didn't know. When the officer explained the situation (you always stop at a stop sign even when you don't see anyone for miles around), the guy aplogized to the officer: "Sorry hoor, I didn't knew that". The cop got agitated and asked him "What did you just say? " so again he said: "Well, I said: sorry hoor, I didn't knew that it was illegal. " The cop got even more angry now and asked him to step out of the vehicle. By now his traveling companion started to wonder what the hell was going on and why tyhe cop was getting angry.
Then suddenly he realized it: "sorry hoor" is a typical Dutch expression. When you pronounce it in a certain way (depending on the Dutch accent you have) it sounds like: "Sorry, WHORE". which is, off course, pretty insulting! Luckily he could explain it to the cop who had a good sense of humor and could even laugh at the situation. 
