keys and spoons
Vegas hotel cardkeys do have another use: free parking when a big convention is in town. The Hilton adjoining the convention center allows "guests" or holders of a free Players card to park for free; parking fee during CES is otherwise $20/entry.
Paris (my memory is failing) also allows free parking for "guests" when it's adjoining convention center is in full swing.
I inherited my parents airline spoon collection, and found the spoons useful for the kids once they self-feeding. My eldest boy likes the UTA spoon, my youngest likes the Finnair spoon.
I travel with a KAL spoon as part of my "immersion heater+mug+teabag+sugar+masala chai drops" kit