Tuck Me In (1:00)
13th Floor; Ignacio Rodó; IMDb; Vimeo; YouTube

A little boy asks his father to tuck him in bed. Then he asks him to look under the bed. What he sees... I don't want to spoil it, but it's pretty unsettling.

Actually, I guess this is based on a two-sentence short story I read online at some point in the past, and this is just one of several short films that have been based on it. I had forgotten about the story until I saw this film, though, and started trying to figure out why it seemed so familiar. (If you want to see other films based on the story, which all have different titles, try Googling "justAnotherMuffledVO")