2008 - Bought my Specialized Langster for the flat 3 mile commute through London that I had at the time.
Started using it for midweek rides when I couldn't be bothered to get the geared bike out of the shed.
Gradually came to realise that riding fixed made me smile much more than riding geared.
For the last few years it's been my preferred ride unless I know it's going to be really hilly or exceptionally windy, when I tend to bottle it and ride with gears. The stupid thing is, when that happens, I'm still strangely reluctant to use them.
Currently running 78.5", which is fine for 99% of Kentish roads.