I posted this story before to another thread a while ago, but this seems like the perfect place for it, and it's fairly short, so here it is...
When I was growing up one of my best friends told me a about a very creepy situation involving him, his younger brother, and a man in the window. When my friend and his little brother were younger they shared a bedroom. They're some years apart, but his younger brother was born with a multitude of different health issues, including multiple sclerosis, and he's confined to a wheelchair and cannot care for himself. So, to keep an eye on him overnight when his parents couldn't, they shared a bedroom.
One night my friend randomly woke up for no in particular reason and happened to glance over at his younger brother, but noticed something very startling; a strange silhouette of a man wearing a top hat looking in through the window behind his younger brother's crib. The first thing my friend did was jump up and turn the light on, then ran into his parents room to tell them what he saw. When his parents came back into their room to investigate, his younger brother was having a seizure in his crib.
A few of his family members say it was his younger brother's guardian angel standing in the window that night; my friend believes it was death.
It's all still pretty unsettling to me.