For me it was thumping, the industry standard way of killing piglets by grabbing them by the back of the head and smashing them into concrete until they’re dead. That or the CO_2 acidifying every mucus lining in a pig’s body, chemically burning them alive while they suffocate to death because people get enjoyment out of it
The one that got me most was Thumping, the standard operating procedure for killing baby piglets. They grab them by the back of the head and smash them into concrete until they’re dead, depicted ~6 minutes into Dominion