中短债

中 = 丨 + 口 : Mnemonic symbol: a dart board, because you always try to hit the center.

Julian Giant Squid (zhu-) is throwing dinosaur bones (丨) as darts on a dart board in front of the engine ((e)ng1). To make it a bit more difficult he's throwing mandarins (口) into the air as well and skewers them up right in the center (中 is a mandarin skewered on a dinosaur bone) in mid flight with the dinosaur bones. He's still able to consistently hit the center (中) of the dart board.

短 = 矢 + 豆 : Doggy Dog (du) is playing darts (矢) with some buddies inside of the anthill (an3). He ate a bunch of beans (豆) before, so every time he throws a dart (矢), he has to go to the bathroom for a short duration (短) to fart.

债 = 亻 + 责 : James II of England (zh) had a great party. He wakes up in the airplane's bathroom (ai4) still wearing his party hat (责) to a very angry Rosa Luxemburg (亻) who wants to claim Jame II's debt (债).