危在旦夕

危 = ⺈ + 厄 : Mnemonic symbol: danger ahead sign.

There is a Greek nymph in front of the Eiffel Tower who goes around to seduce and devour all kinds of people. A crane has spotted her and flies around waving with a "danger ahead" sign to warn others, but Willy Walrus doesn't even notice: he spotted the nymph and instantaneously fell in love with her.

危 = ⺈ + 厄 : Mnemonic symbol: danger ahead sign.

There is a Greek nymph in front of the Eiffel Tower who goes around to seduce and devour all kinds of people. A crane has spotted her and flies around waving with a "danger ahead" sign to warn others, but Willy Walrus doesn't even notice: he spotted the nymph and instantaneously fell in love with her.

在 = 一 + 亻 + 土 : Zorro (z) and Rosa Luxemburg (亻) exist (在) in the airplane's bathroom (ai4). Rosa is in the middle of balancing a flute (一) on her head and on a pile of clay (土). Zorro uses his rapier to inscribe "Z" into the flute, so as to mark that the pronunciation of "在" begins with "z".

旦 = 一 + 日 : Mnemonic symbol: A big mug, since many people start the day with a mug of coffee.

Don Quixote (d) meets the sun (日) early in the morning (旦) in the anthill's bathroom (an4). Don Quixote is full of energy and can't wait to start into a new adventure, but since the sun is a morning grouch who only just started drinking her mug of coffee (mnemonic symbol for 旦) she cannot stand it and beats him over the head with a flute (一) to calm him a bit down.

Mnemonic symbol: this character looks a bit like a bat, and bats come out of their caves at dusk. I could see the upper left 丿 as part of the bat's right wing, ㇇ as the body/head and 丶 as the eye of the bat.

Xi Shi (xi) goes out for a space walk in front of the space station (Ø1) in the evening (夕), where she observes a space bat.