I guess the worst for me was when I was around 10 my parents decided to get me a pen set for christmas. At the time in school we weren't even supposed to use pens. So I couldn't use it there, nor could I use it for my homework. At the time I still preferred using pencil anyway. And they weren't suitable art pens or anything like that either.
It was one of those cheap sets (like $10 tops) but "dressed up" to look more expensive than it actually was. (It was 2 black pens in a small faux wood box with a plastic liner.) It wasn't a stocking stuffer thing either, it was set up as it's own gift.
I felt disappointed and kinda sad. Like my parents didn't even know what I liked. And all my friends got these cool toys but I got pens. So I never even used them.
Eventually, I got so upset that I sealed the box up and threw them into the trash. (Though my mother discovered them sitting in the trash and pulled them out. I found them in my room the next day. Nothing was ever said about it to me, but yeah... can't have imagined that felt too good for her.)