What is the biggest waste of money, even though nobody admits it?

All the things bought for an occasion that will never come and they'll never be used or used only a few times before they expire. Clothes that people think they will fit in, perfumes kept for a special occasion that get spoiled before it comes, shoes that don't fit properly and never will but "they were so pretty!", insurance on stuff that would cost less if you simply bought the new product or had it fixed in case it got broken, subscription to stuff you don't really use..