Juan comes up to the Mexican border on his bicycle. He's got two large bags over his shoulders. The guard stops him and says, "What's in the bags?"
"Sand," answers Juan.
The guard says, "We'll just see about that - get off the bike." The guard takes the bags and rips them apart; he empties them out and finds nothing in them but sand. He detains Juan overnight and has the sand analyzed, only to discover that there is nothing but pure sand in the bags.
The guard releases Juan, puts the sand into new bags, hefts them onto the man's shoulders, and lets him cross the border.
---
A week later, the same thing happens. The guard asks, "What have you got?"
"Sand," says Juan.
The guard does his thorough examination and discovers that the bags contain nothing but sand. He gives the sand back to Juan, who crosses the border on his bicycle.
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