再四

再 = 一 + 冉 : Zorro finally received the flute he was waiting for so long in the airplane's bathroom. He is so moved that he cries 再见 again and again and waves the mail snail goodbye with a handkerchief.

四 = 儿 + 囗 : Mnemonic symbol: a four-leaved clover. Socrates (s) is working out in the bathroom of the space station (Ø4). He's lifting four (四) wooden boxes (囗), and wonders why they are so heavy. He doesn't know that inside one of the four boxes, the monkey king (儿) is hiding and secretly laughing at him - until the monkey king comes out and surprises Socrates with a four-leaved clover (四).