Every time you reload a gun in Battlefield Hardline, there's a very small chance of finding a weird and secret reload animation. The developers thought it would take a while for players to discover them, but as the game's beta moves forward, they have found some rad easter eggs.
This all came to light when someone posted their discovery, prompting the creators to acknowledge there were more of them in the game and challenge players to find them:
Cue the floodgates opening, as many other secret animations were soon unearthed:
This one is probably my favourite, thanks to the subtle Star Wars nod.