Man with tiny brain shocks doctors

[Kritish]

His brain is normal sized, some episode revealed that he's that dumb because of a crayon lodged in his brain.

 

[Superman4ever]

1

I seriously did a double take when I saw the images on the left...My G-d!

BTW, if you guys were wondering the images on the right are comparison shots of a normal brain.

 

[Abaddon]

His brain is normal sized, some episode revealed that he's that dumb because of a crayon lodged in his brain.

and other episodes revealed it's because some experimental drug he took, or numerous knocks on the head. Loose continuity the Simpsons has.