"I knew you were not here"

Last Friday, I tailgated all the way to work but was still five minutes late for the weekly meeting. (It sucks, I know. But maybe I was born to be late.) I had to call my boss's boss's assistant to get me in. She came to get me. We greeted each other. I apologized. She smiled and said, "xx asked if you were already here when I came out to get him, and I said, 'I don't think so.' I knew you were not here cause I didn't hear any laughs."

I was speechless... I thought I was quite serious at work..