In reply to Jon's:
"Granted, keys and spoons are commonplace, ordinary objects...but there are also hundreds of other metal objects equally ordinary. Also, why spoons and not knives and forks?"
Jon, I don't think there are hundreds of objects "equally ordinary."
Cutlery and keys are used by everyone, everyday. What other metal household objects are used by everyone, everyday? I think cutlery (and a spoon in particular) is about as common and universal as you can get.
The spoon trumped over the fork and knife because it is the easiest to work with.
Also, Uri's brilliant "In Home Telepathic Spoon Bend" has ensured over two decade's worth of press photo's depicting the bent spoon in all its glory. The meme rules.
The image has been burned into our psyche.
PS: I wonder if the decline in key bending has to do with the way keys have evolved over the last decade?
Creator of the famous "Floating Match On Card" illusion.
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