Oh, I know how it works 

The statement used after being told how something works or functions.

Even if you may or may not know how this something works or functions, use the statement anyways to cause laughter.

"We're going to have a surprise party; where every one will hide and when the birthday girl arrives we will jump out and yell surprise!"

Nearly interrupt the previous statement with:

"---Oh, I know how it works."

Oh, I know how it works by Smashley22 September 15, 2009