This is so unfortunate. Pedro Ruiz, 22 was shot and killed by his 19-year old girlfriend, Monalisa Perez. The family is saying that the incident happened because of a YouTube prank gone wrong. The couple would do pranks in the past, like eating donuts with powder on them. But Ruiz wanted to get some fame and had the idea to have Perez shoot a .05 caliber at a book that he was holding near his chest. And the whole thing went south!