Talking about my dog and the fact that he barks at everybody who comes to the house with a "Hi, I'm the big dog in charge, so don't mess with my family" tone, and the fact that I have one male friend who he never barked at.
My 11 year old pipes up, "Well maybe Baxter smelled <friend> on you before so he recognized him the first time he met him."
This would be totally innocent on his part, especially considering he was unaware that <friend> and I haven't always had a purely platonic friendship. A different friend was in the kitchen at the time and just looked at me and we both busted out laughing. My child could not figure out what was so funny. We didn't enlighten him.