When I bring a basket of fruits to Dr. Shrunk to teach me an emotion/animation, he makes a comment that he will have to teach me a "really good joke" that day compensate me for the many fruits that I brought.
I am curious to know if there is actually a game mechanic which restricts which emotions can be taught, or if that conversation is just a bit of fluff. Are there any emotions that cannot be taught by giving Dr. Shrunk a single fruit, or can they all be unlocked by bringing him a single fruit each day?