One day god was watching over the world when he saw 2 people in a raft rowing away in the sea.
The 2 people were singing    Row,row,row your boat"  

God said :"Hmm these humans are so hard working that they continue to row even while in the middle of no where,i wonder what will happen if i
took out half their brains"
So god stopped time and took out half their brains then let time resume.

The 2 people continue singing but slower    Ro...w,ro...w,ro...w yo....ur bo...at
Then God said :" WOW,humans are so amazing they can even function after taking out half their brains!!! i wonder what happens if i take out another half" (means 1/4 left)
So god did as before and stopped time to take the brains out.
After resuming time the 2 people were singing but sloower still
R........oooo....www, r.....ooooo......ww, r.....ooooo....w, yooo............ur booooo.......at
Spectacular God thought so he decided to take the brains out completely to see what happens.

When god does that the 2 people sang
  DA.......YUNG, DA.....YUNG.......,DA....YUNG, KA....PAL