Dr. Jekyl and Mr. Fluffles

Mr. Fluffles flipped out on me today for about five minutes. Intestinal distress perhaps. I cleaned his litter and gave him dry food instead of canned. Right now, he’s resting.
He went berserk on me when I tried to get him out of my chair, snarling and hissing. Makes me wonder what I don’t know about his 14 year history.
Either that, or this is my introduction to the wonderful world of feline bipolar disorder.