My wife and I were stationed in Germany for a couple years with the US military. Her only experience with a foreign language was some classes in French in high school, which came in useful since we were stationed near the French border. But while we were living in Germany, we decided to learn some German so we could get around easier.

We took a trip up to Berlin one week and my wife was trying her best to speak to a vendor in German, but she was really struggling. The vendor decided to switch to French instead. Apparently, her German had a heavy French accent, since that was the only other foreign language she had practiced. She was able to finish the conversation in French.