The most famous of the included screensaver modules is the iconic "Flying Toasters" which featured 1940s-style chrome toasters sporting bird-like wings, flying across the screen with pieces of toast. Engineer Jack Eastman came up with the display after seeing a toaster in the kitchen during a late night programming session and imagining the addition of wings. A slider in the "Flying Toasters" module enabled users to adjust the toast's darkness and an updated "Flying Toasters Pro" module added a choice of music—Richard Wagner's Ride of the Valkyries or a flying toaster anthem with optional karaoke lyrics. Yet another version called "Flying Toasters!" added bagels and pastries, baby toasters, and more elaborate toaster animation. The Flying Toasters were one of the key reasons that After Dark became popular, and Berkeley began to produce other merchandising products such as T-shirts, with the Flying Toaster image and slogans such as "The 51st Flying Toaster Squadron: On a mission to save your screen!"