(This one's for you, Carl.)
Nathan: "I want my Sissy tractor."
Me: "Your sissy tractor? Which one is that?"
Nathan: "My Sissy tractor upstairs. I go get it."
(That's when I realized that his little skid steer loader was upstairs in his room. Carlsie usually is doing something with the skid steer when he's out at my parents, so apparently it's her tractor.)