I haven't had any of my families spontaneously water plants, but the stomping ants was done by one of my first generation family members. That same person seemed to be obsessed with destroying insects. His most frequent random actions seemed to be "Stomping Ants" "Finding Annoying Mosquito" and "Taking Insect Outside" He was also the only person I ever saw "Inspecting the Foundation" so he might have been a bit paranoid.