Timestamps:

0:00 S08E13 "Simpsoncalifragilisticexpiala(Annoyed Grunt)cious"
"You have my undivided attention"
Three animated animals play "Turkey in the Straw" as heard in the Mickey Mouse cartoon Steamboat Willie.

0:12 S15E02 "My Mother the Carjacker"
"You always go with your gut.
This time, why don't you listen to your brain?
All right, I will.
( Clarabelle Cow plays "Twelfth Street Rag" on ukulele )
That's why I don't listen to my brain."
The ragtime song "Twelfth Street Rag" was composed by Euday L. Bowman in 1914. It can be heard as the background music on the cartoon series SpongeBob SquarePants.

0:15 S04E22 "Krusty Gets Kancelled"
"I'm gonna use all the power of my brain"

0:23 S21E09 "Thursdays with Abie"
"Marge, my brain is like a computer, and I file away Grampa's stories in a very special place."

0:46 "Simpsons: The Movie"
Cymbal-banging monkey.

0:55 S17E11 "We're on the Road to D'oh-where"
Fun Homer vs Serious Homer

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Also see:
Homer talking to his brain - Compilation
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