Okay I'll bite. I've been on several trains with involuntary debarkations over the years, but I'll chime in with the two most dramatic.
The first was on the Starlight back in the early 1990s. Southbound, starting somewhere south of Portland there was this guy in the cafe area (they really didn't do the downstairs for eating Amtrak food only thing back then) who was inebriated on something. I talked with him for a bit, I had had a few myself. But he wasn't making that much sense even for a drunk and his pupils appeared pinned. I politely ended our conversation, which was getting weird and thankfully he took it okay and moved off. So I was minding my own business. In the meantime, he took up a conversation with an older gent. Suddenly he was yelling about that "...you never took care of me!" at the gentleman and had him cornered. Under the influence of whatever he was on, he had gotten it in his head that the older gent was his father. By this time we were past Eugene, BTW The LSA got the conductor down there, and the conductor got the guy away from the older gent and upstairs. I went to dinner. We stopped at the little yard in Oakridge surrounded by flashing blue lights. The father-issues guy was now in the hands of Oakridge PD.
The second one was audio only, a just a few years ago on the Starlight. I had a scanner, which I hadn't had for the father-issues guy incident. There was a guy that was causing trouble in one of the coaches, and the conductor radioed ahead to have Richmond PD meet us at a grade crossing to take him off (Richmond was no longer a stop). So they got him off. Then it turned out he had left luggage behind, apparently deliberately. The conductor apparently looked inside and there was some illegal substances in there. He radioed that in, and asked for the cops to meet the train in Martinez so he could give them the suitcase. Well, that turned into a drama. While most of it not broadcast on the scanner, he used his phone but was also broadcasting to update the dispatcher and also the ACs as to what was going on. It turned out that no police agency wanted it. Martinez PD apparently did not want to pick it. Richmond PD wanted Amtrak Police to pick it up (I don't know how many Amtrak PD there are in the Bay Area, but my guess is not many). This went round and round and round and meanwhile we sat at Martinez. An increasingly irritated UP dispatcher kept calling the train wanting to know when we would be on the move, and the conductor said he didn't know. It took over an hour to get straightened out, but unfortunately for me, the conductor stopped talking about it on the road channel except responding to the dispatcher ("...still don't know...") about 30 minutes in. In any case, ultimately somebody took it and the conductor radioed the dispatcher we would on the move shortly and we were.