A Chia Pet. I'm being serious. It was from my brother-in-law...I rewrapped it and gave it to him for the next Christmas...
Now..the worst was from my exboyfriend. For our 2nd Christmas together, he bought me a mini-makeup bag set from friggin' Odd Lots. It was red/gold/black/ with little Asian people all over it..it was the ugliest thing I've ever seen. Of course, it had the tag still on it...for $2.99.