Our old cat, he used to go nuts when my b/fs best mate walked in the house, he swears he never did anything towards her, and we believe him, but there is something that spooked her in her past that reminded her of him, she would try and run though windows and everything when he came in the house!
Our little cat knows when 'im indoors is due in after work. That's when she gets her cat treats :-) and if he's ever late.... gawd... her wailing is that she is not amused!!! and she knows she gets 6 treats. If we offer her a 7th she's already showing her butt!!! as she walks awf lol