"He's a lovey boy most times, with a big streak of playful troublemaker."
Sounds right to me! Most of the time our three Siamese males look and act like absolute, cuddley little angels. Then for reasons unbeknownst to us, they throw it into high gear and blitz around the house like maniacs. And that includes, at least in part, the elder of the three who lost his vision last year. Figure that one out.
You 'spose they receive 'Party Hearty' signals from another planet? Some imperceivable thing is going on that sets them off. Wish they'd tell us but they won't. Cats are funny that way.
LOL! I think that explains it very nicely.