釘是釘，鉚是鉚

钉 = 丁 + 钅 : Dorothy Gale (di) is eating a quarter of a pizza (丁) in front of the engine ((e)ng1) with a golden harpoon (钅) when she suddenly finds a nail (钉) on the pizza.

钉 = 丁 + 钅 : Dorothy Gale (di) uses the nail (钉) she found earlier to nail (钉) her pizza (丁) to the wall of the engine's bathroom ((e)ng4) to serve as warning for other visitors. As a hammer she uses a golden harpoon (钅).

是 = 旦 + 龰 : Mnemonic symbol: a skull, from "to be or not to be".

Sherlock Holmes (sh) starts his day in the space station's bathroom (Ø4) with a mug of coffee (旦). Holding a skull (mnemonic symbol for 是) in his hands, he asks himself "to be, or not to be" (是). He wonders if he can make the skull come back to life using lots of coffee, and injects coffee from his mug into the skull using a syringe (龰).

是 = 日 + 下 + 人 : Mnemonic symbol: a skull, from "to be or not to be".

Sherlock Holmes (sh) watches the Neanderthal Man (人) trying to climb to the sun (日) on a ladder (下) in the space station's bathroom (Ø4). Sherlock is afraid that he'll open the window, so he puts on a big skull (是) and scares him off.