I can't even tell you what the first day of my start-up was. I suppose you could argue it was the day I sat down and started writing code on the current iteration of the project I'm working on, in which case the first thing I did was something like:

[prhodes@voyager quoddy]$ grails create-app neddick

followed by

[prhodes@voyager quoddy]$ grails create-app quoddy

and

[prhodes@voyager quoddy]$ grails create-app heceta

After that, it was just lots and lots of coding, up until I discovered Steve Blank's The Four Steps to the Epiphany at which point I stopped coding for a while and started doing Customer Development.

I hacked away on what would eventually, months later become my startup. It wasn't on that day though, it was just a site I wanted to make that had no users, no code, and only a fraction of an idea. It had the perfect name that ended up being dumped though because it was too short sighted.

We setup computers (AMD K2-350 !!) and desks in the morning and played a 2 person LAN game of DoomII for the afternoon. On the 3650th day we played some LAN counter-strike (with a lot more people). Lots of blood, sweat, tears and counter-strike in between. On the 3651th day I left.