Boreal Oakmoss

I heard today about the prank some parents play on their young children.  They convince them that they have become invisible by pretending not to be able to see them.  They clinch the deal by taking a picture of themselves and the child and then showing them the picture which is sans child.  (This is accomplished by setting up the picture earlier when the kiddo isn't around.)  It's a neat trick but from the videos posted on YouTube the children seem quite frightened by it.  Sure, I played peek-a-boo w/ my nieces when they were babies but they just laughed when I magically 'reappeared'.  I also 'stole' their nose when they were tots - though at that age they didn't seem too concerned about losing a body part.