Sneakers hanging on telephone lines have become a powerful urban symbol, inspiring genesis theories both hilarious and sinister. In an effort to get to the truth once and for all we asked the people of earth to help us solve this mystery.

I always wondered why.

On the southern border between Mexico and Guatemala, they don't just hang shoes on the barbed wire fences, they hang shoes with feet inside them as a warning to anyone trying to illegally cross the border. 

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Greg, I would listen to that warning.