So this Mexican guy comes riding up to the border on his bicycle with two big sacks over his shoulders. He tells the border guard that the sacks are full of sand, but the guard doesn't believe him. The guard detains the guy, then rips open the bags--nothing but sand. he even has the sand analyzed only to find out that it really is just sand and the sack is just a plain old sack. Two days later, the same thing happens. And then it happens again, two days after that. Every time, the guy on the bike is carrying nothing but sand. This goes on for seven years. It drive the border guard crazy. He loses his job because of it. So, one day, he tracks the Mexican guy down and says to him:"I'm no longer a border guard, but I gotta know what is it you're smuggling? Because I know you're smuggling something." The guy smiles and says[spoiler]"Bicycles,Sucker"[/spoiler]