At some point he sees a man pushing a bicycle with a huge sack thrown over the seat. He stops him at the border.
"What do you have in this sack?"
"Sand."
"Well let me check."
The officer opens up the bag and indeed it's full of sand. He searches it throughly, but there's nothing else, so he lets the man go.
The next day the same man shows up, again pushing a bicycle with a huge sack thrown over the seat, and again there was nothing but sand in it.
After a few days of this playing out, the customs officer holds up the man a little longer.
"Listen pal, I've been in this job for 10 years now, I can recognize a smuggler from a mile away. I have no definite proof, but I know you have been taking something past this border and it's driving me crazy. Let's make a deal - you tell me what you are smuggling and I won't stop you any more. So what is it?"
And the man replied.
"Bicycles."
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