Just that really! Cleaned his box a few days ago. He's 3, neutered and has never done this before. It was a dry, healthy looking poo iyswim, so at least didn't take much cleaning up.
DH wants to punish him but as we weren't there there doesn't seem much point. I'm going to take cat to the vet to get checked out but I can't work out why this happened and therefore how to stop it happening again.
Has anyone got any advice?