>>937307303
He is upset because he also has a learning disability, but knows he lacks the confidence to wear the appropriate hair style. That's why he wears the hat. To cover his shame.

They're coming to take E away ha ha
They're coming to take E away, ho ho, hee hee, ha ha
To the funny farm
Where life is beautiful all the time
And E'll be happy to see those nice young men in their clean white coats
And they're coming to take E away, ha-ha