In one short story, Jotaro wants to try and cut a plum seed off of Usagi's nose just like Katsuichi did back in the day. Usagi, rather wisely, insists they use a pumpkin as a fair substitute. Jotaro takes one swing of his wooden sword and...there's not much left of the pumpkin.
Jotaro: Er...it flinched.
Usagi: That could have been my head!