At the beginning of the video with this story, you can see that a guy who found out that his girlfriend cheated on him pretends that he is supposedly going to surprise her. He blindfolds her and tells her that the gift is under glass that needs to be broken. Then he gives the cheating girl a hammer and puts her phone under it! At first glance, this may seem cruel. Doubtlessly, the guy decided that cheating on him was much crueler than a broken phone.

@When People Get Revenge On Their Cheating Partner/ Amerikano/ YouTube.com