i also have one villager who keeps doing things like telling a joke, arguing, and complaining. the only thing is that he always does these things to the little lavender flower at the top of the graveyard. no other villagers in sight. it's funny to watch him "argue" with a flower. maybe he's interacting with the same ghost that my other villager was running away from. silly little villagers. lol!
Is the villager a doctor? If so, that's a coding quirk that was present in VV1 - where you would see in the status bar, the next action the doctor would perform after studying the cactus... in the case of VV2 it would be one of the plants