I'm kidding!
A way to tell someone you're still your sister, even if you just called them a two headed donkey.
'I'm kidding!' she said, but I still didn't believe her because she called me a two headed donkey.
He said, 'I'm kidding!' and then we went to get ice cream.
I said, 'I'm kidding!' and then we went to get ice cream because we were still sisters.