I'm going to break up with my girlfriend to prank her.
Are you sure doing that is wise?
Yes, I know what I'm doing.
That's a really immature thing to do to someone. The relationship might not be the same after you do something like that.
It's only a prank and she won't care that much. She'll understand it's a prank.
Are you sure? Because she might not think it's very funny and end up leaving you for real.