Warcraft is one of the most successful multiplayer games in the world and when a popular player died in real life, other people in the game thought it would be a nice gesture to have a virtual memorial service in the Warcraft world.
The friends logged onto his account and took his virtual character to a lake, where the memorial would take place.
But another tribe heard about it and decided to ambush them. They killed the dead guys' character and wiped out everyone else who showed up.
To make things worse, they filmed the massacre and put it on the internet.