3/4s. Profiles tend to break the eye line or line of action is they get used to much.
TRY THIS: The next time someone asks you a question, speak to them only so that they see your profile. They will think you're dodging them, or are hiding something. Like this:
"Who was that on the phone?"
"Nobody" (in profile)
"What? Who was it really?"
"Nobody, really...wrong number..." (stay in profile)
See the power of profiles now? Use them sparingly.