I've had one where my villager found a moth in a cocoon(I killed it by accident), three times someone found a vial of liquid (once nothing happened, twice I poured it out instead), a heat wave where they wouldn't work, rats in a box, spiders in a box, twice I've had rusty tools in a box, I had a stranger in a boat come up asking for herbs and such (extra level of medicine, woo!), a dream about gold and a monster in a cave (I went for the gold and nothing happened), a villager found a book (took it to the researchers and it went missing), found a 'great berry masher' twice, had a monkey mess with the tech table and give me tech points... I think that's about it.