This thread is funny. I want to comment on so many of the gifts, but it would take too long!
Nothing really stands out to me right now as THE worst gift ever, but my exx used to give me lots of crappy stuff. He was from NY so he would go up there alot of time w/o me. This one time for Christmas, he brought back a whole crapload of jewelry for me, swearing it was all real. It was 2 bracelets and a ring I think - well let me tell you, my skin turned so green!!! He bought them of a street vendor - dumbass. Sure they were real.