Chihiro: How do vaccines work? Somebody explain please.
Mondo: Imagine there's a bully in town who wants to kick your ass. You find his picture online and show it to all your buddies so they know what he looks like. When the day comes and you see the bully on the streets, you phone your buddies, they come, recognize him, and beat the shit out of him.
Kiyotaka: THAT IS NOT EVEN CLOSE TO HOW A VACCINE WORKS-
