The ride-hailing giant has released its third annual lost & found index and says the most unusual forgotten item was an 8-week-old Chihuahua.
Other bizarre possessions include a full set of 18-karat gold teeth, a salmon head, a shopping cart, a Lego championship wrestling belt and one - just one - Gucci flip flop.
As for the most common items, they're what you might guess: Phones, cameras, keys and wallets.
Here are some other unusual items forgotten in Ubers last year:
- A black-and-white tuxedo for a small dog
- A propane tank
- A pack of hair and a brown brush shaped like a foot
- A small handmade cat puppet
- A bird
- A mannequin
- Full fish tank with fish and water
- A piece of parchment paper with sap on it
- Dirty laundry