大勇若怯，大智若愚

大 = 一 + 人 : The big (大), huge (大) robot (mnemonic symbol for 大) is working out in the ashram's bathroom (a4). He's lifting a flute (一) to which Don Quixote (d) and Neanderthal man (人) are clinging.

勇 = 力 + 甬 : Yu the Great (yu) has to show her courage (勇) inside of the engine ((e)ng3). While standing next to a yongzhong bell (甬) she'll push its power button (力) for a dare.

若 = 艹 + 右 : Mnemonic symbol: a wooden chicken as in 呆若木鸡, "dumb as a wooden chicken".

A nazi wants to beat up a wooden chicken in the observatory's bathroom for being different, but just as he charges across a sheet of artificial lawn Rachel Rhinoceros pulls she sheet from under his feet and lets him topple head-first to the ground. She thinks that the nazi is truly as dumb as a wooden chicken.

怯 = 去 + 忄 : The Queen of Hearts (qi) is quite timid (怯) and does not dare to use the elevator's bathroom (e4) with her personal protection: a flail (忄) and a concrete barrel (去) which she uses as body armor.

智 = 日 + 知 : In the space station's bathroom (Ø4), the sun (日), Francis Bacon (知) and James II of England (zh) are competing for who's the most knowledgeable of them. They all present each other their smartphones (智能) on which they use apps to determine their IQ (智商). In the end it turns out that they are all retarded (弱智).

愚 = 心 + 禺 : 禺狨王 (禺) gives Yu the Great (yu) his heart (心) in the space station's kitchen (Ø2). Yu the Great is very moved and just as she is about to take it 禺狨王 snaps it away, exclaims that it is just an April Fools' (愚) joke and calls Yu the Great out on how dumb (愚) she is.