大坝

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.

坝 = 土 + 贝 : The crab (贝) wants to use the ashram's bathroom (a4), but Beelzebub (b) built a dike (坝) made out of dirt (土) and the crab is unable to overcome the dike.