I recently learned that the particles called nutrinas would be trapped by the event horizon. They don't interact with gravity but they follow the trajectory of space which is warped by the black holes mass. I would imagine they would accumulate and swirl around the inside of the event horizon and fall down into the centre. I have no idea what is happening in there.
There is a lot of strange things out there. A lot of very strange things. Things I don't really understand. My existence is strange on its own.