They're the little lizards we used to get at the fair, which would turn different colors to try and imitate their surroundings. You and I become chameleons when we become so intimidated by the people and pressures around us that we no longer stand out, no longer make a difference. Peter let those around him affect his actions, and while he couldn't hide or blend in, he would have liked to. Many Christians think doctrine is a dirty word. Doctrine simply means teaching.
Christian doctrine is what the Bible teaches.
Now, when it's happening, Peter is unnerved, unprepared, unprotected. Constant doses of sound doctrine, taken internally, are good protection against sin. But as soon as Peter forgets that, and begins relying on himself, he sinks in the waves, deserts Jesus at the arrest, and here, this night, denies Christ. This church has great potential to serve God in this community. But we mustn't try to do it in our own power.