Candy bar?
I've been racking my brain off and on for years about this.... I remember a movie that had a kid hidden in a house, and he would be looking out at the people in the house through spaces in the wall. I remember him nibbling a chocolate bar. I remember it because I thought "oh! So THAT's what 'worrying at' something looks like".
I had always thought it was a Robbie Benson movie, but now I think it was this one. Can anyone confirm? My sanity would be indebted to you.
Acter