Sorry for the terrible handwriting! ^^'
Here's what it reads:

1st panel: "Dude, what are you doing?"
Thought: You look like you're constipated.

2nd panel: "Am I trying to... THINK!?!"
"I don't know! Are you?"
Thought: Shouldn't he know if he's thinking?
"You can't see!?"
"I can't see what?"

3rd panel: "YES! I understand now I have do to!"
"...what?"

4th panel: "Hard...is....thinking! Mine head hurts..."
"I think all that thinking gave you brain damage!"

2009