Something unusual

This is to test your ability to get out of the box and think outta it :D

This is an unusual paragraph. I'm curious how quickly you can find out what is so unusual about it. It looks so plain you would think nothing was wrong with it. In fact, nothing is wrong with it! It is unusual though. Study it, and think about it, but you still may not find anything odd. But if you work at it a bit, you might find out. Try to do so without any coaching!

Guess what's unusual about the para above.
For my die-hard Riddle buddies... Nessa & Spiff... here's to you :D

p/s: Spiff.. no googling for the answer! U can ask Hobbes.. but no googling.. ;)