Let's discuss our worst projects! More precisely those which were a bad idea from the beginning, and that we look back at with embarrassment (but also maybe with benevolence and tenderness... Depends how much time passed, I suppose!
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This idea is from this thread : https://forums.tapas.io/t/the-importance-of-thinking-short/55603/22
In my case, the first bad ones I remember were poems heavily influenced by (plagiarized from?) Gerard de Nerval (French poet and novelist who wrote a lot about (and with) mental illness and with who I used to identify a lot).
I was obsessed by this author during my 11-14 yo period but obviously was entirely missing the necessary life experience and poetry skills. I wrote dozens of poems in his style which were absolutely terrible. What's a bit sad is that I stopped writing poetry entirely after a few years because I never got free from that influence even after realizing it was no good (I suppose because I was so young? Or maybe I did not try enough).
More fun: My other obsession in these years was Monkey Island 2. And yes, I totally wrote a Nerval and Monkey Island 2 crossover. WTF was I thinking? 
Other later errors:
- writing modern day teen stories, but in a general Beat Generation mood (probably would be excellent if made well but nope when I was a older teen/young adult);
thinking Proustian sentences are versatile and can be used everywhere (including scientific literature; I feel so sorry for my first advisor);
trying to emulate Faulkner's style for intellectually handicapped Benjy into French for one of my character (the way I did it would probably have been very offensive... if it was not an autobiographical character! Again, what was I thinking?). There were many more but these ones are the most embarrassing.
My latest one, that is just a few years ago and still stings a bit, is of another kind.
It was an illustrated novel that was really too ambitious. Maybe not theoretically a bad idea, but anything that is so ambitious that it is not possible to implement, is somewhat a mistake.
It was a story about two characters of different social classes in Sumer as discovered in a Medieval French manuscript adapted from an older Arabic manuscript. By the time I would have done enough research to make that work I would probably have had time to write a PhD thesis. BAD idea!
But it still stings because I loved the idea and already had passed a lot of time working on it when I realized it was silly.
Ok now, I'd like to hear all YOUR embarrassing stories! 