Ernest Hemingway couldn’t beat it and it eventually got the better of him. Winston Churchill referred to it as his “black dog”. Abraham Lincoln referred to himself once as “the most miserable man living”. Mark Twain said “Everyone is a moon and has a dark side which he never shows to anybody.” Teddy Roosevelt lost his mother and wife on the same day, sending him into a deep depression. Charles Schulz, the creator of Snoopy, was unhappy for the extent of his adult life.