Could someone explain this weird piece of graphic design?

Found hanging in our bathroom at work over Christmas, with no clue as to who produced it or put it there, was this poster:

A list of holiday tips, using icons in the place of words. For instance, Tip 1 (in the top left) is Don't Drink and Drive, using pictures of a bottle and a car to represent 'Drink' and 'Drive'.

So, internet. What does this mean?