This is an abnormal paragraph. It is not normal at all. All of its writing is grammatically right, but it looks wrong. If you find what's wrong, you'll show your skill in sight. If you can't find it, that's alright. Not many found it instantly. You may look on for hours and hours, or you may find it soon. In any way, it isn't normal. Why?
This paragraph contains no words with "e" in it. This is abnormal as "e" is found most commonly.
A man bumps into his mathematician friend on the street that he hasn't seen in 5 years. The man asks the mathematician how old his children are. The mathematician, who always replies in riddles said, "I now have three children. The sum of their ages is equal to the number of windows on the building in front of you and the product of their ages equals 36." The friend then says "I need one more piece of information." The mathematician then replies "My youngest child has blue eyes." What are the ages of the mathematicians three children?