Whether you're royalty or a roaming vagrant, a President or a pauper, one thing's for sure: At some point, you'll have to use the restroom. While sanitation isn't often brought up in polite conversation, it plays a vital role in human health, and over the centuries various civilizations have come up with some pretty innovative ways of staying clean. Globally speaking, the bidet is one of humanity's most popular sanitation technologies -- it's spread across Europe to Asia and beyond. So why don't Americans use these? Join Ben and Noel as they crack the case in this Classic episode.