Seinfeld...famously, it's the show about NOTHING. And yet, for it being about nothing, there are SO MANY memorable moments throughout the show's nine seasons, from the Soup Nazi to The Contest. And yet, one of the most enduring storylines was the infamous "Death by Envelope," where Seinfeld's best friend George Costanza's fiancee keels over after licking too many envelopes. But could that ACTUALLY happen? With Seinfeld just released on Hulu and Jason Alexander revealing the TRUE reason behind Susan's death on Howard Stern, now seems as good a time as any to examine this sitcom staple!