Harvard Reading test

HARVARD READING TEST for Randy DurrThis was developed as an age test by an R&D department at HarvardUniversity. Take your time and see if you can read each line aloudwithout a mistake. The average person over 50 years of age can't do it
!1. This is this cat
2. This is is cat
3. This is how cat
4. This is to cat
5. This is keep cat
6. This is an cat
7. This is old cat
8. This is fart cat
9. This is busy cat
10. This is for cat
11. This is forty cat
12. This is seconds cat
Now go back and read aloud the third word in each line from the top down and I betcha you can't resist passing it on.