To-morrow is Saint Valentine’s day,
All in the morning betime,
And I a maid at your window,
To be your Valentine.

– William Shakespeare

Hamlet, Act 4, Scene 5. Ophelia, suffering a mental breakdown, sings this poignant song about lovers and Valentine’s day. It aludes to the superstitition that if two single people meet on the morning of Saint Valentine’s day they will likely get married.