涉外

涉 = 步 + 氵 : Sherlock Holmes (sh) suspects the five paced viper (步) to have killed an innocent person, so he is looking for it in the elevator's bathroom (e4). The snakes hides in one of the many water bottles (氵), so Sherlock has to wade (涉) through the bottles and the water in order to find the viper (步).

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).