Jon tries to get into the Deconstructor Fleet mindset after watching a video where he is recommended to, while shaving, move his face instead of the razor. It doesn'tend well.
Jon walks slowly into the shower after noticing Frank's mask in a nearby bin, thinking he'll see Frank's face for the first time. Unfortunately for him, Frank was showering while wearing another mask.
The ensuing backing-and-forthing between Jon and Clara, building up to Jon comparing her to Josef Fritzl, followed up by a sudden, "CUUUUUNT!"