鑒於

鉴 = 刂 + 大 + 金 : As Joan of Arc (ji) is looking at a bar of gold (金) in the anthill's bathroom (an4), she sees a reflection (鉴) of the robot (大) who wants to kill her with a kitchen knife (刂) and is warned (鉴) just in time.

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.