Ah, thanks for that. I imagined it was some kind of Japanese pun, but i translate from Spanish and they seemed to have no idea either, so i was kinda stuck. My kanji is too trash to get jokes like that.The punchline of the "knock knock" joke Kfufu said at the start of this chapter was a pun between 幸福(Happiness) and 降伏(Surrender) in Japanese
I mean this fact made me question a lot of things tooSo we gonna ignore that Kfufu just minimize that Plane?