This would make a fantastic caption competition. My own suggestion is that he is saying, to the rather bored woman:
"This little piggy went to market, this little piggy went to... hang on, wait I got confused, let me start again, damn, why is it so difficult to remember after seven pints?".
What do other people think? Carol will award a prize to the best answer.
I was just going to comment how I often feel the same way when getting images back. I remember the moments but not all the details... almost as if I'm in a weird "moment seeking trance" leading up to pushing the button, it somewhat blanks my ability to take in details during the process. It's weird.
But as for a caption...
"Hey, that lady is taking a picture of us... look away." "I can't open my eyes, let alone move my head... but how about a photo of -this-."