Embarrassment at its finest.

Today I had the funniest, most embarrassing moment at work.
This guy came over to the counter, a pretty good-looking older man, about 50, who asked me for some help, beginning with, "memory, it's the first thing to go, with us old guys."
As I was fiddling around on the computer, helping him out, he stood there, rambling...
And I quote: "everything else works, though!" (Emphasis not changed, in fact, he kind of pointed his finger ramdomly into space when he said 'else,' I promise.)
I kept my head down, trying to focus on my computer, but could not help but start laughing, and kind of said, "good to know..."
So, he was still rambling, "my eyesight is still good..." and he noticed I was laughing, and he called me out, "oh, you're thinking bad!"
I wanted to crawl under the counter and hide. So embarrassing.