必修課

必 = 丿 + 心 : Mnemonic symbol: 忽必烈 [Hū​bì​liè​], Kublai Khan. Certainly (必) Kublai Khan (必) has to keep face, but he cannot hold it any longer. In the space station's bathroom (Ø4), He absolutely has to (必) tell Brunhilde (bi) his love for her strong character and offers her his heart (心). Brunhilde is a bit embarrassed because all she has to offer in return is a banana (丿). Kublai Khan feels like his heart has been crossed out (the 丿 stroke is crossing out 心 in 必).

修 = 彡 + 攸 : In front of the outhouse Marie Curie tries to repair her binoculars. She's been working on it for such a long time that she already grew a long Santa Claus beard.

修 = 彡 + 攸 : In front of the outhouse Marie Curie tries to repair her binoculars. She's been working on it for such a long time that she already grew a long Santa Claus beard.

修 = 彡 + 攸 : In front of the outhouse Marie Curie tries to repair her binoculars. She's been working on it for such a long time that she already grew a long Santa Claus beard.

课 = 果 + 讠 : Karl Marx (k) notices an advertising column (讠) in the elevator's bathroom (e4). He decides to teach these capitalists a lesson (课) and throws grapes (果) at the ads, messing them all up. That'll teach them!