A groom in Fujian, China, found out that his new wife had cheated on him with her pregnant sister's husband and decided to let all of the guests know during their wedding reception
The footage of the cheating fiancee and her sister's husband was played for guests immediately after the MC announced that they were going to play a flashback video of the groom and bride's 2-year-long relationship. As the footage was playing out, the groom points at his bride and says, "you thought I didn't know?" before wedding guests had to break up the newlywed couple.
The (unverified) 5-minute long sex tape was captured by a hidden camera that was installed in the couple's new home.