This is embarassing. About 1wk after ET came on board, 1 cat lady came visiting, ET hissed at her. Then months later, a friend's 3 year old daughter was very keen in seeing ET, came visiting, they got hissed at too. Both times, he went under the fish tank rack and hissed at our visitors when they went near him. Even when the other feeders he knew came visiting, he will hide under too, minus the hissing, lol. He seemed ill-mannered, but what to do with a super timid cat?
Whenever he hear someone at the door, whether they were passing by or stopping by, ET will dash back to his room and then hide.