In that comment, and probably in other instances, you could drop the first "that" and the sentence would still be grammatically correct. "I know for a fact that cat has a penis."
In that comment, and probably in other instances, you could drop the first "that" and the sentence would still be grammatically correct. "I know for a fact that cat has a penis."
Example usage: [https://phuks.co/s/Cats/9242/a14af1ec-989d-4bbd-b583-016d0d1ca084](I know for a fact that that cat has a penis)