Casper didn't just sell mattresses — it sold the idea that a mattress company could be a tech company, and for a wild few years, investors actually believed it. We dig into how a foam rectangle became a billion-dollar narrative, why the unit economics were broken from day one, and what happens when a brand is so good at marketing that it fools even itself. Last week we watched Andrew Mason turn coupons into chaos — this week, we watch a different kind of founder bet the whole bedroom.