Baggage loading
The trouble with baggage loading is it varies so much. At a tiny airport they may well put each bag straight onto the trolley which then gets pulled out to the aircraft. If that's the case the first bags will be at the bottom of the pile, last into the aircraft, first off onto the trolley and at the bottom of the pile again so last onto the conveyor.
All that assumes one trolley. Add a 2nd trolley and all bets are off; fill one first, then the other or spread the load across both trolleys in some logical, or more likely, illogical way? Now, when you get to the aircraft the trolleys will get loaded one by one so now everything is potentially mixed up. And the whole process at the other end will probably have bags coming off onto one trolley and when that's full the rest go on the next trolley. Which gets offloaded first at the terminal?
Now think about somewhere like Heathrow. People checking in 3 hours before departure for a 747. The bags probably go to a holding area then into a container. Some airlines prioritise bags of premium classes so First and Business bags go into the last container loaded on the plane (in theory). By the time the bags have been put in several containers and then several containers have been offloaded and taken back to the terminal who knows what order they're in.