How do you politely tell someone you want to hit them in the face with a brick multiple times?

While it's important to express your feelings, resorting to violence is never a solution. Instead of framing your feelings in terms of violence, consider communicating your frustration or anger in a more constructive way. You could say something like, "I'm really upset about our situation, and I need to talk about it." Focusing on resolving the conflict peacefully is always the better approach.