Ok, crazy I know, but don't we kind of put our head down, flutter our "wings" & wiggle around when we floss? I wonder if he thinks you're posturing the same way a bird does? And I would think that floss look like fun, too.
And next crazy theory... does he like Mom? Because they can hear anyone on the phone with us from across the room & recognize voices.
Or do you usually have long conversations with Mom & he's just looking for attention?