Thats the "something just touched my dick" face.
You ever get so confused that you slapped a contortionist in the testicles?
"Funny thing about my back, Jules. Is that it's located on my cock"
Edit: a word
You can see the sheer genuine shock as he realizes what he just did.
How did you find out you had this talent?
"Someone on the internet told me to shove my head up my own ass and, well, here we are."
I've seen this contortionist kid.
He was in the Cirque du Soleil show Luzia. He had a really creepy look on his face during his routine...