Here's an idea for a fun thread that will probably be shut down.
RickyJim has suggested
that W-18 'is just about the worst witness of the bunch.'
My nominee is Mary Cutcher.
An early police report (p. 18 of the May 17 release,
the 184 page pdf), says that Cutcher at first denied witnessing anything.
What she would later claim to have seen and heard amounted to little, was heavily mixed with hearsay and speculation, and was often not consistent with other witnesses.
Cutcher and Selma Mora claimed that Mora spoke with Zimmerman. In his SPD interviews Zimmerman spontaneously described his encounters with W-6 and W-13, but never mentioned seeing or speaking to Mora. I don't think any of the other witnesses mentioned seeing her either.
Cutcher made the rounds of the talk shows, not concealing her identity, expressing solidarity with the Martin family and sometimes in company with them. She used her authority as a witness to promote Zimmerman's guilt, supporting her position with speculative arguments anyone could have made. She has presented herself as biased and a publicity hound.