Sam and I were swimming in the pool at my mom's gym. Sam's a little nervous about swimming by himself, despite wearing a life jacket, so I have to hang onto him and swim at the same time. We were both hanging on a pool noodle, pretending it was our "pirate ship", when I look back and find out that Sam's no longer kicking his legs.
Me: Hey! You're supposed to kick your legs, too. We're the boat motor. It doesn't go if we don't kick it.
Sam: Oh. Okay, Mom. (starts kicking).
Me: Sam, don't bend your knees so much. You have to point your toes. Look at Mom's legs.
Sam kicks again, like he's peddling a bike.
Me: Straight legs. Straight legs. Why are you bending your knees?
Sam: That's how God made them.