What Chinese words are puzzling foreigners?

An American who just learned a little Chinese came to China, and his friends in China invited him to dinner. When I arrived at the hotel and sat down, my domestic friend said, "Excuse me, I'm going to the toilet." Foreigners don't understand, where is convenience? Seeing the foreigner wondering, his friend in China told him that convenience means "going to the toilet" in spoken language. Oh, foreigners understand. During the dinner, a friend from China said to the foreigner, "I hope you can provide me with some convenience next time I come to the United States." The foreigner wondered: Why did he go to America and ask me to provide some toilets? When saying goodbye, another China friend here enthusiastically said to the foreigner, "I'd like to invite you to dinner at your convenience." Seeing the foreigner dumbfounded, my friend in China went on to say, "If it's inconvenient for you recently, let's take a rain check ..." The foreigner was speechless. "Let's have dinner together when it is convenient for you and me." The foreigner fainted immediately.