How do you get "porn star" from "pastor"?

I went in for a job interview for a position at school in the International Students Office. I was expecting a one-on-one and not a panel. I came in, shocked. My nerves got the better of me and I was nervous, so much so that my voice was soft and low and I stuttered, stammered, and mumbled.

One of the questions was: "What are your parents' occupations?"

I told them my mom was an accountant and my dad was a pastor. One of the panelists had a shocked look on his face and exchanged looks with the others. He goes, "I'm sorry, WHAT NOW?!?"

Then one of the panelists (who knows me) says, "His father's a pastor."

Then he was embarrassed and says, "Trust me. You do not want to know what I thought I just heard you say."

Apparently, he thought I said my dad was a frigging porn star.

HOW do you get "porn star" from "pastor"? It was one of the clearest things I ever said throughout the whole interview!