Looking on the internet deeply has found these results:

Why I did not know that! is the most popular phrase on the web.

We'll is this your final answer? 10 results on the web	Why I did not know that! 19,300 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Jun 4, 2012 ... It's also precisely why I did NOT know that the same David who killed Goliath as a little kid grew up to be King David. Because no one had ever�... Oct 9, 2014 ... Michael Strahan is on Magic Mike II? OMG! Why? I did not know that. Now there is a question to be answered. Is he interviewing the dancers? Remove. Remove. JuanJose Alvarez Celis Why I did not know that. January 22 at 4:42pm � 1. Remove. Remove. Shayla Daigneault. Shayla Daigneault's photo. asked the dame, wonderingly: and then Warrenton saw how he had blundered. " Why, I did not know that you had met your cousin, Robin. When was it, and why�...

We'll is this your final answer?

10 results on the web

Why I did not know that!

19,300 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Jun 4, 2012 ... It's also precisely why I did NOT know that the same David who killed Goliath as a little kid grew up to be King David. Because no one had ever�...
Oct 9, 2014 ... Michael Strahan is on Magic Mike II? OMG! Why? I did not know that. Now there is a question to be answered. Is he interviewing the dancers?
Remove. Remove. JuanJose Alvarez Celis Why I did not know that. January 22 at 4:42pm � 1. Remove. Remove. Shayla Daigneault. Shayla Daigneault's photo.
asked the dame, wonderingly: and then Warrenton saw how he had blundered. " Why, I did not know that you had met your cousin, Robin. When was it, and why�...