Money. I went on a city break with a friend who came with no money and so I ended up paying for all food/drinks etc. She looked annoyed at me buying a keyring as I didn’t offer to buy one for her too. We’re not friends anymore and she never returned the money.
Shoes. I picked friend up after a night out and she asked to borrow shoes. She kept them for two years (they were brand new) and retuned them in a state where it was obvious they’d been worn multiple times.