吉
=
口
+
士
:
Mnemonic symbol: "Giga" stems from a Greek word for "giant", so I'll represent 吉 by a giant.
吉
=
口
+
士
:
The giant just arrived at the space station and is very hungry. In each hand he holds Joan of Arc and the bachelor captive and robs them for their mandarins which he longs for.
庆
=
大
+
广
:
The Queen of Hearts (qi) and the robot (大) are celebrating (庆) parachute day by parachuting (广) off the stones in the engine's bathroom ((e)ng4).