MEXICAN CYCLIST

A man on a bike, carrying two saddlebags, was stopped by a guard while crossing the US-Mexican border.  He had rigged up a primitive rope bridge to by-pass the customs control.

'What's in the bags? demanded the guard.
'Sand,' the cyclist answered.
'Take them off. I need to take a look.' retorted the guard.

The guard emptied the bags and found out they contained nothing but sand. The man reloaded his bags and continued across the border. A week later, the same man was crossing again with two more bags. The guard demanded to see them, and again they contained nothing but sand. This continued every week for six months, until one day the cyclist failed to appear. A few days later, that same guard ran into the cyclist in Tijuana.

'Hey, where have you been?' the guard enquired. 'You sure had us wondering. We knew you were smuggling something across the border. So tell me and I won't say a word. What was it?'

The man smiled broadly and told him the truth, 'Bicycles!'

:D