了然於胸

了 = 乛 + 亅 : Sir Lancelot (l) has completed (了) his preparations to fight the world. There he stands ready, on top of the Elevator (e5), with a sickle (乛) and a crowbar (亅) in his hands.

了 = 乛 + 亅 : Mnemonic symbol from "to finish" and the shape of the character: a prize cup.

Li Qingzhao (li) is responsible for manufacturing a prize cup (了). She only needs to add a poetic engraving. Unfortunately, she suffers from a writer's block. In the aorta's living room (ao3), someone left a cryptic message engraved on the walls using a sickle (乛), which is still lying on the floor. Being an accomplished poet Li Qingzhao is able to understand the message clearly (了), realizes its poetic potential and starts to engrave it on the prize cup using a crowbar (亅).

然 = 灬 + 肰 : Robinson Crusoe is grilling some dog meat on his BBQ in the anthill's kitchen, but it's hard to do it correctly because of all the animal rights activists. They think it's not right to grill dog meat.

于 = 亅 + 二 : Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.

Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.

胸 = 匈 + 月 : Xu Xian (xu) noticed Bela Lugosi (匈) is just going out when the full moon (月) is shining at the night sky and suspects that he is a vampire. Therefore, he plots against Bela and one month later, he rams a stake into Bela's chest (胸) in front of the engine ((e)ng1). Bela just feels a little chest (胸) pain but nothing more, since Xu Xian missed his heart.