What’s something you tried to make but turned into an epic failure?

I tried to make baked cheese crisps. Bake little piles of shredded cheese until they become a little burnt and crispy. I put the cheese on wax paper and baked. The cheese just malted all over the place and got stuck to the wax paper. Giant mess. I had to throw it all away.
What’s something you tried to make but turned into an epic failure?
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