User blog:KimeramonRocks/Puzzla

What's a Puzzla? It is a paragraph with something wrong in it, but the flaw is so well hidden that you will be driven mad by it. Spelling mistakes don't count, if there are any. Now for the Puzzla:

How quickly can you find out what is so unusual about this paragraph? It looks so ordinary that you would think nothing was wrong with it at all; and in fact, nothing is. But it is unusual. Why? If you study it and think about it you may find out, but I am not going to assist you in any way. You must do it without coaching. No doubt if you work at it for long, it will dawn on you. I don't know. Now, go to work and try your luck.