What is the worst deal you have ever made?

Too hard to pick. Many years ago I bought a giant puzzle. First bag was good but in second bag many pieces were poorly made(falling apart). More recently(like a year or two ago) I bought a drawing tablet. And only after buying it discovered that I can(and prefer) to draw with mouse. I also some time ago hoped to go on date and bought men's perfume. That(or any other) date did not happen so perfume is still waiting in a bathroom. But I suppose this was not so bad as first two options- I could still use that perfume in the future...