What is the exposition of the movie inside out

As the little girl Riley is moving from Minnesota to a new house in San Francisco, Sadness (one of the emotions in her head) touches a joyous memory and somehow turns it sad. Joy—the chief emotion—panics and convinces Sadness to move back where she can’t have any effect on Riley. This does a great job of introducing the conflict on a number of levels: Riley’s discomfort with the changes in her life is the main conflict in the “outer” story; Joy’s conflict with Sadness is the main interpersonal conflict; and Sadness’s ability to affect established memory’s becomes a catalyst throughout the plot.

happy birthday to you
happy birthday to you
happy birthday dear (name)
happy birthday to you.

from good friends and true,
from old friends and new,
may good luck go with you,
and happiness too.

alternative ending:
how old are you?
how old are you?
how old, how old
how old are you?

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