Two?

A few years ago on a morning walk through a new subdivision being built.  Two? 

The other day at the dog park a man was bragging that he did not waste anything, he said one time he was looking at new houses being built in a new subdivision and said he saw a quarter inch metal screw on the pavement.  He picked it up to put it in his collection, "You never know when you might need it."  He said.  Then I told him what I saw (and took this picture) one time.  "You never know when you might need it." I mocked.  I'm a smart ass.