First of all, I must present my own interpretation about Bananaman. Prof Armstrong threw us the question of what relationship exists in the film and of who the Banana Leader is. First of all, the man, who looks a little like Paul McCartney when he was young, must be the Banana Leader, for he taught the other man how to make everything done with a banana.
Secondly, I think that the situation is happening in the apartment or something like that, in which not only a man but also many other men live in cooperation. There is no doubt that if many men live in an apartment, it gets messy as it was in the film. Probably the two men are friends, which is the relationship between them.