Let's see...
A Charter Arms Mag Pug .357... the story here is that I needed a conceal piece for a couple of weeks while mine was on the way (moving.) So it wasn't specifically something I thought I wanted, but I still hated it. After about 100 rounds through it, the guts bound up and it had to be repaired.
Walther P-22. After I found out that Ceiner made a 22 conversion kit for my Beretta 92FS, I got rid of the Walther.
Ithaca M37 shotgun. That one I was real proud of... until I tried to fire, well, anything through it. After a week of polishing the chamber, I got mad and sold it and bought tires for my truck. My tires have yet to jam.