可控硅

可 = 丁 + 口 : Karl Marx (k) is challenging his abilities (可) in the elevator's living room (e3). He tries to force a nail (丁) into a mandarin (口), just by using his head. On top of that he tries to do so one thousand times, in order to create a bed of nails (mnemonic symbol for 可).

可 = 丁 + 口 : Alternative mnemonic symbol: kebab, from the pronunciation "ke". Karl Marx (k) is preparing a kebab (mnemonic symbol for 可) in the elevator's living room (e3). He also skewers mandarins (口) on the long steel nails (丁) and will only allow (可) his guests to eat the rest of the kebab if they eat their mandarins first.

控 = 扌 + 空 : Karl Koala (ku) cannot find the air conditioner's (空) remote control (控) in the engine's bathroom ((e)ng4; he's sitting on it). He doesn't want to get up from the sofa either, so he switches the aircon on using a long toy claw (扌).