I KNOW THAT'S RIGHT - You say it whether you actually get it or not. If you don't

You say it whether you actually get it or not. If you don't get it, you're probably trying to make it sound like you do.

'I know that's right!' he said, even though he had no idea what was going on.

She said, 'I know that's right!' like she was trying to sound cool.

He said, 'I know that's right!' even though he had no idea what the question was.