The shoe theory suggests that gifting shoes to your partner bring bad luck into your relationship and will eventually cause lovers to break up with each other.
According to the website, people in China have promoted this idea for a long time, which entails that gifting someone a pair of shoes is like “giving them a bad spirit.”
This old shoe theory was brought again to the surface by TikToker @crystalations, who shared a now-viral TikTok video that reads: "I got my man shoes for Christmas and completely forgot about the shoe theory."