密不透风

密 = 宀 + 必 + 山 : Marilyn Monroe (mi) is secretly (密) making out with her secretary (密) Khubilai Khan (必). Because it has to be a secret (密), they meet in the space station's bathroom (Ø4) and hide under a huge graduation cap (宀). Just to be sure Khubilai Khan has two forks (山) in his hands to attack anyone who might enter and see them.

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

透 = 秀 + 辶 : Tecumseh (t) is taking part in a talent show (秀) in the outhouse's bathroom (ou4). His performance involves him dancing in gladiator sandals (辶) and using the sandals to penetrate (透) and smash all kinds of barriers made of concrete, steel, and your worst enemy.

风 = 乂 + 几 : Frankenstein's Monster has to wait in front of the engine. Because the wind is blowing, he uses pliers to disassemble a small table and builds a shelter with the parts.