The best interpretation of the expression "Life is like a box of chocolates. You never know what you're going to get." is that life is unpredictable and full of surprises. Just like when opening a box of assorted chocolates, where each one is different and you never know what flavor you will get, life presents various opportunities and challenges that may be unexpected. It suggests that one should be prepared for the unexpected twists and turns in life and embrace them with an open mind and a sense of adventure.
