The worst bike I had is also the bike that gave me some of my greatest bike related memories.
I can't remember the model name, but it was a bright red junior size Viscount road bike from the Universal catalogue. It was a present from my mum for my first birthday after my dad died, I was 11.
Up till then I'd ridden a battered old second hand chopper, which I learned to ride on and loved, but the viscount was a brand new bike. It wasn't that great as a road bike, the tyres were much wider than other road bikes I'd seen, it was heavier than my brothers and it only had 5 gears. It probably qualifies as a BSO and was all my mum could afford, I loved it.
I used to get up two hours early for school so I could take it out for a ride. I used to spend my pocket money on accessories, customizing it with new bar tape and stickers. I've never spent more time on any bike before or since. Whole days were spent exploring with my brother and friends. It taught me so much about bike maintenance too, I used to clean it once a week, learned how to change cables and brake pads etc.
Sadly I don't have any pictures of it, it was stolen from outside the corner shop when I was about 14.
Looking back I think subconsciously that bike inspired my 700c Pioneer build. It too is bright red, has wide tyres and drop bars, although it might be lighter

Never really made the connection before now, but I really do think it feels as close to that old Viscount as anything I've ridden since.