"My brother has a very special attack. If you see a blue attack, don't move and it won't hurt you."

I nodded, having figured that out from the previous attack.

"Here's an easy way to keep it in mind." Sans continued. "Imagine a stop sign. When you see a stop sign, you stop, right?"

Again, I nodded, wondering where he was going with this.

"Stop signs are red. So imagine a blue stop sign instead."

"Wait, what!?" Chara was confused.

"Simple, right?" Sans asked.

"Yeah," There was actually some logic behind it. I mean, why aren't Stop Signs blue?