"You take the blue pill – the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill – you stay in Wonderland and I show you how deep the rabbit-hole goes." -Morpheus
The term red pill and its opposite, blue pill, are pop culture terms that have become a common symbol for the choice between the blissful ignorance of illusion (blue) and embracing the sometimes painful truth of reality (red).