What's Happening in My Backyard?

Danilo Escobar: Have you ever heard of an anti ninja floor? Yes. So that even the best ninjas couldn't sneak across it. In 16th century Japan, there were rumors of ninja prowess and these rumors were spreading. By 17th century, manufacturers designed a countermeasure which would alert people who were sleeping in the building if there was a ninja sneaking around where you're sleeping.