I still don’t know what Uncle Wei means by taking people to see goldfish?

The real case originated from Sham Shui Po in the 1960s. At that time, public housing estates were established in Hong Kong. The population in the estates was densely populated. At that time, Hong Kong's light industry (mainly textiles, clothing, toy processing, etc.) hired a large number of people. Women and children lack parental care. During this period, many vicious cases occurred in which underage girls were molested and raped. Through investigation, we learned that a man used the excuse of raising goldfish on the rooftop and taking little girls to see the goldfish, and lured the little girls into molesting or raping them in a deserted place. And his most common line is: "Little sister, uncle will take you to see the goldfish. Is it good? The goldfish has big eyes and is so cute." ..." At that time, some people in society called it the Jinyu Lao case ('Lao' is a term for adult men in Cantonese-speaking areas, which is not very respectful, but generally does not have a derogatory connotation). The police soon arrested a 29-year-old plastic factory worker surnamed Fang. He later admitted to 18 crimes and was sentenced to life imprisonment. It was the heaviest penalty since the indecent assault case at that time. Since then, the term "Goldfish Guy" has spread like wildfire and has become synonymous with a pervert who specializes in abducting children and indecent rape. Now in Cantonese, saying to others "Uncle will take you to see goldfish" is a somewhat obscure "colorful" joke. Kingfisher became the nickname of "Uncle Weird" (weird uncle, alluding to pedophilia).