Schröder's Fractals, Chaos, and Power Laws had a digression about a family of distributions where the longer you've gone without observing something, the longer

Schröder's Fractals, Chaos, and Power Laws had a digression about a family of distributions where the longer you've gone without observing something, the longer the expected mean time to first sighting becomes. I read that and immediately thought well, this explains software schedule slips. "The first 90% took us 90% of the scheduled time; the last 10% will take the other 90%..." (editor's note: 9% of that last 10%, anyway!)