Grug promptly throws the banana on the ground in anger before slipping on it.
Sweet emotions crop up because we can all relate to the family dynamics.
Grug takes his family into the forest to find a new cave.
Grug becomes less protective, letting the family be more adventurous and risk-taking, thus bringing happiness to them all.
This verdant heaven on Earth is already occupied by the significantly more evolved Bettermans: Phil, Hope, and their daughter, Dawn.