My first commute followed my birthday around 10 years ago, when my then girlfriend (now Mrs Mandopicker) gave me the larger of her two bikes. Politely I thanked her, wondering why was I being given a bike.
This was a Trek hybrid, a guys model, that went by the unofficial moniker of 'Eric'. Now Eric was a bit of a beast - heavy, chunky, but deeply characterful. Eric had been nicked during his previous life in and around York University, but Mrs Mandopicker tracked him down and confronted the new 'owner' and got him back. Having been brought to us in bits, Eric underwent reanimation after intensive (and expensive) surgery at the Bicycle Works.
At the time I was travelling from Morningside to Salisbury Place, not exactly far or arduous, but the first couple of rides were excruciating as a decidedly unfit me ground my way there and back. I walked like John Wayne.
My wife still remarks that I was deeply (deeply) unappreciative (at first) of the gift, but given the investment in new parts, I stuck with it. I resolved that I would not quit.
Gradually, over the weeks, it got easier. I figured out faster ways there and back, figured out that leaving a lock at work meant I didn't have to carry one with me and replaced heftier tyres for something slightly sprightlier. Inevitably I got fitter and grew to rather like the idea of getting to work faster than ever before. Visiting EBC by chance, I stumbled on their sale and left laden with bike stuff. I was officially hooked.
'Eric' would take me on a tour and then my first Pedal For Scotland (a freak accident meant the rear mech died 300m from the line, so I hefted it cyclocross style and staggered over the line). Eventually the costs of repairing Eric reached a point where it just wasn't economic. Eric 'retired' to the Bicycle Station and, I hope, is now someone's useful bike.
As a postscript, the bike I replaced Eric with lasted three years. A heavy crash left it in several bits of expensive scrap. Lightweight alu frames might be nifty to ride, but I bet Eric would've survived...