Uber's Lost and Found Index features the most commonly forgotten and unusual items left behind by riders.The report highlights 10 most commonly forgotten items, and 50 most unique lost items.Clothing, phones, keys, wallets, headphones, jewellery, books, watches, laptops, and backpacks were among the most commonly forgotten items.The list of 50 most unique items included a fingernails, a fog machine, a lightsaber, a mannequin wig head, and an important pregnancy test.