Ted Cruz spent a whopping 21 hours delivering his fake filibuster on the Senate floor. His lengthy address — intended to derail Obamacare and/or create a lot of buzz about Ted Cruz — included many pop culture references and a reading of Green Eggs and Ham. And, what is a haphazard Washington diatribe without a reckless comparison to Nazi Germany?

+ Part of Cruz’s efforts are aimed at creating the threat of a possible government shutdown. Here’s a look at every previous government shutdown, why they happened, and how they ended.