Read this:
This is this cat
This is is cat
This is how cat
This is to cat
This is make cat
This is a cat
This is person cat
This is say cat
This is that cat
This is this cat
This is joke cat
This is is cat
This is old catThis is yes! Cat
This is I cat
This is agree cat
This is with cat
This is you catNow go back and read every third word. But i'm sure you've already done that! :)