Dogtrousers
Lefty tighty. Get it righty.
When was the hybrid bike invented, that's the best cycle marketing invention!
When I was a teenager there were two kinds of bike (in my world, at least): Racers, which had derailleurs and drop bars, and ordinary bikes, which to my memory didn't have a name, which had flat bars, chain guards and 3 speed hubs. Apart from those differences they were pretty much the same thing. All the bits seemed to be compatible. They were pretty much all made by Raleigh.
Anyway, in about 1977 I cobbled a derailleur and a wheel with a 5 speed block onto an old flat bar bike I bought from someone at school. It worked kind of OK.
I invented the hybrid.

Ordinary bikes were bikes that were ... ordinary.