正確路線

正 = 一 + 止 : Mnemonic symbol: a stick-figure with straight lines. James II of England (zh) really has to use the engine's bathroom ((e)ng4), but there's a stick-figure (正) blocking the stalls with a barrier (止). The stick-figure measures with a flute (一) whether James is tall enough to go. James stands very straight (正) to make himself as tall as possible.

确 = 石 + 角 : Cupid found a huge horn in the elevator's bathroom. He knows that if it were genuine, it would be worth a fortune. He knows also that there is only one way to find out: by crashing a stone on it he'll find out whether it is the real stuff.

路 = ⻊ + 各 : In the space station's bathroom Lenny Lemur dreams of becoming a football star. He imagines walking down to earth on a road of stars, his football in his hands.

线 = 戋 + 纟 : Mnemonic symbol: barbed wire.

线 = 戋 + 纟 : The silk worm wants to use the floating tank in the anthill's bathroom, but there's already Marie Curie inside—and she secured the tank by setting up barbed wire all around it.