Have you checked out thebackpew.com? He has some really amazing cartoons designed with the Christian community in mind. His Bible stories for Easter and Christmas are really insightful and attractive. I love his sense of humor. He has some really cutting edge stuff.
A visual really is worth a thousand words, that's why it is so important to use them every chance we get. If you want to use some of his cartoons be sure to request permission and while you're at it, support his ministry.
This cartoon is almost too true to be funny, that' the problem with a cartoon, it hits us square between the eyes. It is so important that we communicate clearly to our students, so they grasp the understanding of what we are saying. One way to evaluate if we have communicated clearly is to ask questions. Questions, clarify and solidify concepts in the learning process. And use visuals...check out thebackpew.com its really awesome!