On a side note, I'd really wish that "How many straight lines does it take to make a circle?" guy at the beach would ask me.

Because the answer is "one", and the beach is the perfect place to prove it.

"Go to a long beach and look out at the water to the horizon. The horizon is straight, right? Look as far left as you can and still see the horizon over the water. Now slowly turn to the right and keep looking at the horizon until something gets in your way. The horizon stays totally straight and flat that entire time.

"Now imagine you're on a tiny island way out in the middle of the ocean, like one of those desert islands cartoonists draw. Look straight out in front of you. Straight, flat horizon still, right? Now slowly spin in place. You will see the entire horizon, perfectly straight and perfectly flat, all the way around until you have made an entire rotation. 360 degrees of straight, flat horizon.

"So what shape does that horizon have to be in? A circle, right? There you go. You only need one straight line to make a circle."