If I had known that 'if I would have known' was becoming the new norm, then I would have got quite upset... I keep hearing people on youtube saying 'if I would have' instead of 'if I had' or 'had I', and to my ears it sounds jarringly wrong. Does it sound as wrong to you? I come across things like: 'What if Napoleon would have won?', or 'If I would have received your letter, I would have [...]' I'm a native English speaker, but I didn't grow up in Britain, so I learned the language from my parents, books and TV, rather than from other young people. This makes my experience learning the language a bit different that of the average man on the street in London or New York, so I wonder if those examples sound as jarring for you as well.