Explanation:
It is ironic because we can recall that Anne and her family were not entirely safe at that moment, soon this sudden display of happiness was short-lived, and it goes contrary to how we would expect them to have a good time. Commenting about these events going on, Anne said,
"One day we are laughing at the comical side of life in hiding, and the next day (and there are many such days), we are frightened, and the fear, tension and despair can be read on our faces."
