Scared me

I am busy here on my computer doing my online task and my son in his bedroom playing while my daughters are sleeping and the TV was off. Suddenly I heard a knock on our door and it scared me. I hate it when somebody knocks on our door my mind starts racing right away that it might be a bad man. This is what happens if you always listen to the news. It was my friend she had dropped by for few minutes to return the things that she had borrowed from my son. We never expect her to drop by at night. She said that they had just come from eating dinner. We talked for few minutes then they left to go home.