If you've ever had kids or been around kids who haven't lost their teeth yet, you will know that elders say they can see things we adults cannot.
My ex-wife and I were living in a two-bedroom apartment with our two young boys. This was before we had our daughter. Anyway, the older son was 3 and the younger son was 1. The younger son had just started walking.
One day we were in the living room watching TV. The way the living room was setup, the TV was in the corner farthest away from the hallway leading to the bedrooms and the bathroom. We were all seated on the floor, turned towards the TV except for the youngest son. He was seated facing us, in the direction of the hallway.
He was playing, sucking on his bottle, looking at mommy and daddy, when all of a sudden he frowned and started crying. He pointed towards the hallway. Knowing that there was nobody else in the apartment, my hairs immediately started standing up. I turned around towards the dark hallway and grabbed my son at the same time to comfort him. Of course, I didn't see anything, but he was frightened stiff and shaking. I tried my best to comfort him and staying calm at the same time. After a couple minutes and turning him away from the hallway, he stopped crying.