面膜

面 = 丆 + 囬 : Mnemonic symbol: a spray flask with one of these liquids which make a surface super slippery.

In the anthill's bathroom (an4), Marilyn Monroe (mi) wants to set up a wind wheel (丆) on top of a closet (囬). Just as she tries to fix it she slips and falls down, the wind wheel crashing on the floor. She didn't notice that somebody used a can of non-stick coating (面) on the closet's surfaces (面).

膜 = 月 + 莫 : In the observatory's kitchen (o2) the moon (月) and Mozart (莫) are spanning a membrane (膜) as a trampoline for Mahatma Gandhi (m) to jump on.