I Know For A Fact - A way to cover up your complete lack of knowledge with a lou

A way to cover up your complete lack of knowledge with a loud and proud declaration that you're totally right about everything.

I know for a fact that your dog is the best. Also, I know for a fact that your dog is plotting against you.

I know for a fact that you're lying. Also, I know for a fact that I’m not.

I know for a fact that you failed. Also, I know for a fact that you're a bad person.