I independently arrived at[0] something close to Max Tegmark's idea of the Mathematical Universe, almost nobody noticed and fewer still cared because I published it as a LiveJournal blog post whereas he fleshed it out into a whole book.
I didn't get credit because I didn't do the hard work that deserves credit, I had the flash of inspiration and stopped after a few paragraphs of mediocre student philosophy.
This is just plain wrong. No working version without the idea.