An Overwatch player found an easter egg at the end zone on Blizzard World. The area is supposed to mimic a zone from Diablo III, so it's no surprise the mechanic shows off a legendary loot.
If you destroy the boxes and pottery scattered around the last zone, there is a chance "legendary loot" will drop. There isn't an actual item that will drop, but you can see a golden light appear just like in Diablo III. The game is made to be a loot simulator, as you grind through waves of monsters, as endless amount of loot drops.
Redditor Owlero posted the clip of themself going through the area farming the boxes and clay jars. At the last set of boxes, they destroyed them and saw the golden light appear.
It's small easter egg, and you don't get to use a cool item or anything, but Diablo fans will appreciate the small detail. Things like this make Overwatch special, and the reason why people still play. Blizzard cares about the smaller details, and fans notice.