https://www.pcgamer.com/oops-destiny-2-pc-players-were-able-to-acquire-a-ps4-exclusive-exotic-weapon/

Destiny 2's Wavesplitter exotic trace rifle is one sweet piece of firepower. It is also, until September, exclusive to the PlayStation 4. Which is why some players, such as Cloud_Fish, were excited but also confused when they discovered that they'd acquired the weapon despite playing on non-PS4 platforms.   

You can probably guess where this is going.