外匯

外 = 夕 + 卜 : There's a hole in the wall of the airplane's bathroom (ai4), and from outside (外), a bat (夕) wants to enter. Willy Walrus (w) is very afraid of bats, so he does his best to hinder the bat from entering with a voodoo staff (卜).

汇 = 匚 + 氵 : Helga Horse (hu) brought a collection (汇) of water bottles (氵) and a metal box (匚) to the Eiffel Tower's bathroom (ei4). Each bottle contains water from a different river. Finally the moment she's been waiting for arrives: As she empties each bottle into the metal box, she converges (汇) the water of all these rivers at once.