Read this.

take your time and see if you can read each line aloud without a mistake.
the average person cant.
this is this cat
this is is cat
this is how cat
this is to cat
this is keep cat
this is a cat
this is ****** cat
this is a busy cat
this is for cat
this is forty cat
this is seconds cat
now go back and READ the third word in each line from top to bottom