醉心于

醉 = 卒 + 酉 : Zapatista Zebra (zu), the rooster (酉) and the soldier (卒) all drank too much (醉). Now, they are standing on top of each other (like the town musicians of Bremen: the rooster on top of the soldier, the soldier on top of the zebra) and puking into the Eiffel Tower's toilet (ei4) in turns.

心 = 乚 + 丶 : Marie Curie (xi) uses a shovel (乚) to dig a hole in front of the encampment ((e)n1). She wants to bury her heart (心). To the side are three petal leaves (丶), with which she wants to cover it afterwards.

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.