My friend's dad was like this. One day when we were teenagers he had a pool in the backyard and we had towels on our shoulder and swimming pants on and we're walking towards the back door. His dad turned and said, you guys going swimming? We said, yeah. He said, in the backyard? We said, yeah. Said, thought so. Still not sure if he was fucking with us but he used to do this kind of shit all the time.