THIS!The one thing that scares me the most is walking around with my net out during the summertime at night! I'm afraid that a Scorpion or a tyrantula will come running at me outta nowhere.
The scariest thing would be breaking/corrupting/deleting the game save or cartridge. I don't really care much for villagers that leave.
In the GCN game, if a villager gave you an item to deliver to a villager, then you never deliver it due to them moving out, the item will stay in your inventory forever. That's one thing that scared me exclusively to the GCN game.
Did you know that if you failed to deliver an item to said villager you can give it to the Fountain guardian and he will take it.