Jose approaches the Mexican border on his bicycle. Hanging from his shoulders he has two large, bulky bags.
The guard says, “OK get off the bike and we’ll take a look. Who carrys all that sand around?”
The guard takes the bags and emptys them on the ground and sure enough there’s nothing but sand.
However he is suspicious and so he detains Jose overnight while he gets the sand analysed. The next morning he receives the report that states that there is nothing but pure sand in the bags.
The guard has no choice but to release Jose and puts the sand into new bags, slings them onto the man’s shoulders, and waves him across the border.
A week later exactly the same thing happens. The guard asks, “What have you got in those bags?”
Jose replies “Sand.”
The guard performs the same examinations on the bags and discovers nothing but sand. Once again he gives the sand back to Jose who crosses the border on his bicycle.
This sequence of events if repeated every week for over a year until finally Jose stops showing up.
A few weeks later the guard bumps into Jose in a Cantina in a local village.
The guard approaches Jose and says , “What’s happend to you lately I haven’t seen you”.
Jose replies “That’s right I have finished the job I was doing.” “So what sort of job involves taking bags of sand over the border” asks the guard.
Jose sips at his beer and replies, “Smuggling bicycles!”