This is called a "Door Viewer" (I call it a "peep hole").
It's about 4$ in the "door hardware" section of your local hardware store.
It opens up... (unscrews).
That black thing is a film canister. I cut a small hole in it...
The screw the door-viewer into place in the film canister.
Turn on your standard point-and-shoot camera... and advance the Zoom until the lens is at it's "shortest".
Hold the film canister / door viewer over it...
Mess with settings... try with flash and without...
Here's a crummy example of the output.
I'll try to get some better shots in sunlight tomorrow. :)
Fun eh... :D