You remember that you just watch A Wong Kar Wai* movie when you hear someone talking on the phone in Chinese** and the voice oddly sounds familiar.
You know that you watch TOO MANY Wong Kar Wai movie when you start looking for subtitle :D
*or your own favorite Hongkong/Chinese/Taiwanese director. Actor/actress will also work.
** or Mandarin, or Taiwanese. Actually, can't tell the difference :P