兒歌

儿 = 丿 + 乚 : Mnemonic symbol: "son" (儿) sounds similar to "Sun" like in "Sun Wu Kong", so it's gonna be represented by the monkey king. Albert Einstein (Ø-) and Sun Wu Kong (儿) are fighting in the space station's kitchen (-Ø2). Their weapons: Albert Einstein has a shovel (乚), and Sun Wu Kong has a banana (丿).

歌 = 哥 + 欠 : Guy Fawkes (g) lost a bet to his elder brother (哥) Godzilla (哥), who is waving with the IOU (欠) note Guy Fawkes signed when they made that bet. Now he'll have to sing a song (歌) to Godzilla in front of the elevator (e1).