Comedians like to push and push and push until that very fine line of what is deemed acceptable and unacceptable is somewhat squeezed to its very limit. That, to me at least, is what the very best comedy can do. Regardless of the situation that we find ourselves in today when it comes to what can and cannot be said, which is primarily being lead by 'activists' on social media, we need to be grateful that a movie such as Ben Stiller's "Tropic Thunder" exists in this maddening stratosphere.