The following was developed as a mental age assessment
by the School of Psychiatry at Harvard University. Take your time and
see if you can read each line aloud without a mistake.

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 the third word in each line from
the top down and I betcha' you cannot resist passing it on.