It's that fun day when many among us will be parading around in a disguise. Mary Baker Eddy writes about evil, or error's disguise, in some interesting ways, like this:
Jesus strips all disguise from error, when his teachings are fully understood. By parable and argument he explains the impossibility of good producing evil; and he also scientifically demonstrates this great fact, proving by what are wrongly called miracles, that sin, sickness, and death are beliefs — illusive errors — which he could and did destroy. – Mary Baker Eddy –
Just think, you too can recognize disguised errors (beliefs about hurtful bad stuff) coming to the door of your thought and strip away their costumes, instead of letting them trick you!