When I check in for a haircut at my barber, I am asked for the last four digits of my phone number. I always have to start at the BEGINNING of my number in order to recite the last four digits (try it!), so to me the impressive feat was being able to start anywhere within the 1000 digits and go forwards and backwards.

I'd like to ask Nelson about his personal passwords. Does he use different passwords for every site without writing them down? I can imagine his answer: "Sure! On Amazon.com my password is DvB8%3#Ksq, which is easily remembered by associating it with dancing hippos juggling purple ponies; on Yahoo my password is Wtr54@jH5z, which is an unraveling mummy climbing the stairs of the Seattle Space Needle; ..."