Extra questions in the U.S

On flights going to or inside the U.S., you will probably be asked some extra security questions before or during check-in. Here are some sample questions and the correct responses:

Agent: Did you pack your bags yourself?
You: Yes.

Agent: Are you carrying any firearms or flammable materials?
You: No.

Agent: Has your luggage been in your possession at all times?
You: Yes.
Agent: Has anyone given you anything to carry on the flight?
You: No.

Agent: Are you aware of the regulations regarding liquids in your carry-on, which must 3.4 ounces or less and placed inside a single quart-sized transparent plastic bag?
You: Yes.