Eagle-eyed readers may have noticed an advert at the bottom of some of our Haloscan comments boxes. These ads are selected by gnomes working deep in the bowels of Haloscan,Inc. and we have no control over them. But this one caught my eye – “Fahrenheit 9/11 – see it, but if you laugh more than 3.5 times you don’t get it”.

This leads to three questions:

1) Hein?

2) Could the advert be more offputting?

3) (most crucially) What is 0.5 of a laugh?