Writing.

I used to think there was nothing more painful than reading back some "comedy" writing you did when you were about 11, thinking you were funny.

But I have found something more painful. Disturbingly painful.

It's when you read something you wrote when you were 11, and it's funnier than anything you write now:

"I'm gonna give Michael a piece of my mind!"
"Be careful, you don't have much to spare"

That is a brilliant line. If I came up with that now I'd take the rest of the day off.