Why Unicorns Are Extinct

I read his line in the voice of Family Guy's Mort Goldman. (Via)

I like to believe that once upon a time, unicorns roamed this great Earth.  In my world, they were as beautiful and graceful as the fairy tales make them out to be.  But sadly, they are no more.  And perhaps this comic explains why.  Now to break the sad news to my esteemed co-editor, Unicorns Exist...