I once lost a blak blazr jacket in a shop, whilst trying on coats. I gave it to my mum to hold, and she dropped it somewhere and it completely vanished from sight. It was the shop where I bought the jacket, so I assume an employee picked it up, thought it was new stock and hung it up somewhere, but we searched and couldn't find it, and the manager searched and couldn't find it. I concluded that blak blazr jackets have self-destruct mechanisms and just cease to exist at a secret, pre-arranged time.

(I had to buy a coat to go home in!)