Witcher

A person that underwent rigorous training, suffered several mutations and has been gifted with several resistances and magical powers. They're tasked with the killing of monsters, dispelling of curses and concocting of potions, in exchange for coin.

Peasant: I hired a passerby Witcher to kill the drowners by the bridge. He should be done by now.

doing a Chris Witcher

To lose your keys and then eventually find them in an obvious place

"John, we need to go, where are your keys?"

"I'm not sure, think I'm doing a Chris Witcher"