A childhood belief about monsters

When i was really little, about 3 years old or so, we lived across the street from a cemetery. There were these little mausoleums with stained glass windows, one of which was right across from our front door. One evening i was looking out the front window watching for my grandparents' car, when i saw a light come on inside the mausoleum. I completely flipped out. I was positive that corpses has risen from the dead and turned on the light in their little house. Turns out it was just our porch light, which my dad had switched on when he saw me staring out into the darkness, reflecting off the stained glass.