败血症

败 = 攵 + 贝 : Beelzebub threatens to hurt a crab with a sledgehammer should it not obey in the airplane's bathroom. The crab has no option but to declare defeat and obey Beelzebub's orders.

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.

症 = 正 + 疒 : The stick figure (正) is visiting James II of England (zh) in the engine's bathroom ((e)ng4) to have him investigate his colorful rash (疒). Unfortunately James II of England has to tell him that he has cancer (症).