I'm happy you got to relive some memories of your trip to Paris. Hopefully most of them were positive! I'm guessing that incident might have taken place on line 2. I've seen quite a few crazy people on it late at night. I once saw a drunk guy lying down in the bendy bit between carriages opposite where I was standing. He was the only person not wearing a mask and so people were trying to keep a distance from him (this was back in 2020 when masks were compulsory). He asked me for some change and then just threw up right then and there. Something about that particular line brings out some bizarre behaviour