A viral video circulating on social media has sparked debate over the safety of paper cups, commonly thought to be a better choice than plastic. The 40-second clip features a woman demonstrating that the inner lining of a paper cup is actually a thin plastic layer. According to claims backed by research from the National Library of Medicine (NIH), pouring hot liquids at temperatures of 85–90°C into these cups can release approximately 25,000 microplastic particles into 100 ml of the drink, along with potential traces of heavy metals such as lead, chromium, and cadmium. The video concludes with a suggestion to avoid paper cups and instead use a steel flask. This message resonated with many viewers, prompting a wave of reactions on social media. While some users called for stricter regulations on disposable cups, others questioned the scientific basis of the claims. The discussion reflects a growing concern about the safety of everyday items and the environmental implications of their use.