Got A Sinking Feeling About Sis

(My sister and I are watching ‘Captain America’ for the first time. We reach a scene where a bad guy tosses a kid in the water to escape.)

Sister: “People back then couldn’t swim!”

Me: “What?”

Sister: “In the 1940s, people couldn’t swim.”

Me: “That has got to be the dumbest thing you’ve ever said.”

Sister: “Wait, what?”

Me: “You think that people in 1950 just magically realized that it would be pretty cool if they could swim in the water?”

Sister: “Wow…did I really just say that?”