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," answered 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.
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