過於

过 = 寸 + 辶 : Gitta Giraffe is trying out her new gladiator sandals in the observatory's bathroom. She's even able to cross a puddle of water with them by just walking on the water, so thumbs up for her!

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.