树液

树 = 对 + 木 : Sheldon Shrimp cultivates a Christmas tree in the space station's bathroom. He is very happy that he found the right tree, just the one he imagined, and—in his mind—marks of the tree he imagined with a big green check mark.

液 = 夜 + 氵 : Maud Younger (y) wanted to empty her chamber pot (夜) in the elevator's bathroom (e4), but she finds the toilet clogged. She'll have to store the liquid (液) in an empty water bottle (氵) instead.