song / CL:支[zhi1],首[shou3] / to sing
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).