Play It Again (1:49), great example of simple and quick, taking an anonymous PSA from who knows when, and making it a commentary on obsession.
It was collected from Radio Lost and Found, last Thurs, which has lots of other stuff, an alternate version of Guns, a Negativland show recorded in Portland in 1991, etc.
Thanks, JA. And Rich.
UPDATE 7/30/15: I forgot the "for further" link. This track and others like it can be found here.