课

课 = 果 + 讠 : Karl Marx (k) notices an advertising column (讠) in the elevator's bathroom (e4). He decides to teach these capitalists a lesson (课) and throws grapes (果) at the ads, messing them all up. That'll teach them!

果 = 木 + 田 : Gitta Giraffe (gu) is not feeling well inside observatory (o3) and decides to eat healthy. To plant a field (田), she first distributes Christmas trees (木) as manure, then puts a field on it and finally plants grapevines. Soon she will be eating grapes (果) and feel better.

Mnemonic symbol: this character looks like a big "i" (like in information), and I'll represent it by an advertising column. Maud Younger (y) gives a speech (讠) standing on top of an advertising column (讠) in the anthill's kitchen (an2).