Codeswitching

I love watching people codeswitch. I work with a couple who speak Korean. She is from Korea and he is from Washington DC. Whenever they talk to each other they speak in Korean; but when they talk to others its in English. Sometimes I really want to know what they are saying, but its fun to watch them change languages. I know that I have been in situations where it was really awkward for people around me to codeswitch. I know a little Spanish, but not enough to have a conversation. I know that my grandma starts to speak German sometimes, usually when she wants to show an emotion she cant describe in English. I really envy the people who are talented enough to be able to codeswitch between languages.