The Fog

David's quote to Walter when he enters the room, sneaking up on Walter, is from a poem:

Fog
By Carl Sandburg

The fog comes
on little cat feet.

It sits looking
over harbor and city
on silent haunches
and then moves on.

David says the first line, I guess he just likes poetry, and recites it ominously, but I feel like everything David says has to mean something, so I guess he is the fog that sits looking over the city. Hah