Try this

Read the sentence below out loud.

Read it again out loud. 

This time point to each word with your finger as you read out loud.

Did you miss the second “THE” when you read the sentence each time?  Chances are you did.  If you didn’t, you’re a freak!

Seriously though, the brain doesn’t process the second “THE” because it’s tricked into thinking it already has.  The fact that it’s on the second line after the first “THE” is the reason.  It’s redundant.

If you did catch it, try it on someone normal.

via The Amazing Jonathan’s Every Trick in the Book book