An expression from the movie "The Matrix," where the lead character gets to decide whether or not he really wants to know the "truth" about life or not. He is told: "If you take the blue pill, you wake up in your bed, and you get to believe whatever you want to believe. If you take the red pill, you stay in Wonderland, and I show you how deep the rabbit hole goes!"
Blue Pill is the codename for a somewhat controversial rootkit based on virtualization technology that targets Microsoft's Windows Vista operating system. Blue Pill uses AMD Pacifica virtualization technology, but reportedly could be ported to use Intel Vanderpool. It was designed by Joanna Rutkowska and demonstrated at a Black Hat Briefings on August 3, 2006.