蓋世

盖 = 皿 + 羊 : Guy Fawkes (g) always has to cover (盖) his rice bowl (皿) with cling wrap in the airplane's bathroom (ai4), otherwise the sheep (羊) will eat all the rice and get a stomach ache.

世 = 廿 + L : Mnemonic symbol: the WTO or WHO.

Sherlock Holmes (sh) is cleaning a flower pot (廿) under the shower of the space station's bathroom (Ø4) with a loofah (L) because he didn't quite understand a poster next to the shower from the WHO (世) explaining dangers arising from different germs.

In this case, L is for loofah.