Interacting with living things, there's always this feeling of personality. Especially with pets but even with small animals.
Even at a distance, most text delivers this gut feeling that *someone* is at the other end.
Old abandoned web posts have this vibe of a cold, empty room after a party - people were here, but they're somewhere else now and you missed it.
The stuff that LLMs produce has this impression of re-animated, amalgamated horror to me. Like a shambling puddle of corpses.