孝
=
⺹
+
子
:
Mnemonic symbol: a mourning veil. Marie Curie (xi) was breeding an egg (子) in the aorta's bathroom (ao4), and she even put a crown (⺹) on it (the crown is on top of the egg: 孝), so much she loved her little prince. Unfortunately the egg died, and thus Marie Curie put on her mourning veil (孝).
Sherlock Holmes is about to lose against Santa Claus in a boxing match in the engine's bathroom when he uses a dirty trick: lying on the floor he grabs some dirt and throws it into Santa Claus's face, thereby blinding him. Sherlock uses the opportunity to land a critical blow onto Santa Claus's big belly, but Santa doesn't even notice.
宪
=
先
+
宀
:
Marie Curie (xi) wants to commemorate the FLOTUS (先) and sets up a statue (宪) in the anthill's bathroom (an4). The statue is wearing a graduation cap (宀) and holding the constitution (宪) as if it were reading it to the people.