兢
=
克
:
As Joan of Arc (ji) is captured and disabled with two straitjackets (克) in front of the engine ((e)ng1) she is very fearful (兢) and apprehensive (兢) of the things to come.
克
=
儿
+
古
:
Karl Marx and Sun Wukong both tried to change the world. After they both failed, they went crazy, and now they have to retreat into a cloister in the elevator's bathroom wearing straitjackets.