The discussion centers around the phenomenon of piezoelectric sparks produced by Wint-O-Green Life Savers when chewed in the dark. Participants share personal experiences and methods for observing the sparks, noting that the crystals in the candy discharge a spark that is amplified by the sugar molecules. Some users report unsuccessful attempts to see the effect, attributing it to insufficient darkness or humidity levels. The conversation also mentions alternative sources for similar sparks, such as certain band-aid packages. A reference is made to a past article in Scientific American discussing this topic, highlighting that the phenomenon is not new to some individuals who have known about it for years.