That river in Egypt

"My ass feels weird"
He reached back towards that area to investigate. He flinched as his fingers touch cold hard metal.
"OH MY GOD"
There was definitely something there that was not when he went to sleep. He always kept his screws in his pants pockets, not his prison pocket...

At that moment, a green alien with a giant forehead beamed into the room from above, landing before Damocles.
"Oopz. I zee that you have notized my blunder"
"What on Earth are you on about?"
"I may have abducted you a little in the night perchanxe. We were exploring your body vor rezearch purpozez"
"Okay yeah great cool uhm WHY is there metal in my ass?"
"We were having a good look with our new probe. I might have vorgotten to zcrew on the head properly. That iz my bad"
"You what??"
"The head ov ze probe came off during ze exam. I didn't know that it waz a manual zcrew-on, the good onez are automatic. Xeep Xinese xhit"
"..."
"I have come back vor the probe head. Come with me and we xhall remove it vrom you"