Not too many, but I guess the top one would be the car we bought after getting married. We were in love with the idea of getting a new car, and we could afford it, so we did. Threw a rod after about 12K miles, while I was on the way to the dealer to have it looked at. Fixed under warranty but it was just a bad car. Never bought another new car, ever since we've bought 1 or 2 year old cars with good reliability ratings that had bad resale value, and none of them have been troublesome.
Also, cheap furniture. Cheap furniture is cheap for a reason. It's great for the guest room where it will not get heavy use, but other than that... forget it.