I thought I'd replaced all of these outlets that are falling apart in our old house. Nope - missed one.
The guts of these things are a neat look at how to manufacturer something useful by mostly bending metal creatively.
What's really impressive is the stamping die which does all of that bending in one press cycle.
@trinsec yup. The faceplate screw was the only thing holding the plastic on, but the internal conductors weren't making proper contact anymore.