If we think of the first movement of this piano sonata as a quiet, thoughtful and reflective morning kept to oneself, then this second movement is sort of like the day/afternoon. The happy theme that the movement begins with seems to illustrate the normal, happy interactions with others in everyday life. This theme (don't laugh :P) reminds me of playing pokemon on a gameboy when you are walking around a town and the chipper music is playing in the background.
However, not everyday can be completely pleasant. When you walk through the grassy sections in a pokemon game, you can be called into a battle by a wild pokemon, and the music changes to the battle music. The chipper happy beginning theme of this movement sometimes takes a turn into A minor, perhaps representing a little drama or problem amongst everyday life- but, like a pokemon battle, it isn't major drama and is quickly resolved.
So there you have it- Pokemon: Inspired by Mozart!
Well, just kidding about that.... but you never know...
Again, Mitsuko Uchida with movement 2: Menuetto