I'm kidding!
A phrase you say when you're telling the truth, but it sounds so crazy no one believes you.
'I'm kidding!' I said, but I really did eat 12 pizzas in one day.
He said, 'I'm kidding!' but I knew he was telling the truth because he ate 12 pizzas in one day.
She said, 'I'm kidding!' but I still didn't believe her because she ate 12 pizzas in one day.