What was the worst screw-up you've ever made in the crypto world?

I for one had made $360 from a shitcoin that took off. I was planning to buy a 50-inch TV, but there was another project that they were talking about a lot and it made all the sense in the world that it was going to be revolutionary. In the end it was a flop, and I put $250 into it!

Obviously I ran out of the TV, and now it's super expensive to buy. At least what I had left I used to do some household shopping.