自动免疫

自 = 丶 + 目 : Mnemonic symbol: a hand mirror, which someone uses to look at themselves.

The Eye of Providence (目) is looking at itself (自) in a handheld mirror (自) in the space station's bathroom (Ø4). It think it's indeed looking very good, since Zorro (z) attached a petal (丶) to its eye (目).

动 = 云 + 力 : Doggy Dog notices a lot of smoke when he enters engine's bathroom. Instead of thinking long, he acts quickly and moves to push the fire alarm button.

免 = ⺈ + 口 + 儿 : Mnemonic symbol: 免责说明, a disclaimer.

Marilyn Monroe and the crane are on a date in the anthill. Sun Wukong served them cocktails in two mandarins, but the cocktails are so terrible that Marilyn and the crane had to puke all over the place which ruined their date. They want to sue sun Wukong, but he just shows them the place's disclaimer telling them that he is exempted from any responsibility.

疫 = 殳 + 疒 : Maud Younger (y) was supposed to fight an epidemic (疫) in the space station's bathroom (Ø4), but all she got was a halberd (殳). Very soon she got a colorful rash (疒) herself, but she still stands guard in the bathroom and forces everyone to wash their hands regularly.