Reminds me of this story:
Every morning, around 10 AM after the rush is done, a kid wearing a backpack rides his bike across the boarder.
After a week of this, the boarder security people stop him, ask to check his pack. The kid says, "Sure." The guards find nothing,
Another week goes by, same daily crossing with the same kid wearing the packpack riding over the boarder. This week though, the boarder security people check his pack each day and lift the bike and shake it to see if they hear anything rattling around in the tires and tubes. They find nothing in the backpack nor do they hear anything in the tires/frame.
Security is perplexed. What is this kid doing? They suspect he is smuggling but what, and how?
So for the next two weeks, they search him every morning at the crossing. They even get the sniffer dogs out, but the kid, his clothes, the bike, the pack, clean. Can't find a thing.
After two months of this, kid riding his bike across the boarder wearing a backpack at the same time every day, getting search every day, and finding nothing, one of the security guards stops him and says, "Hey, here is $250. Tell me what you are smuggling and how and I won't arrest you, but you will have to stop crossing the boarder.
"Make it $500."
"Ok, but you'll have to come back tomorrow, I don't have it on me."
"Ok, see you tomorrow", and then he rides across the boarder as he has always done.
Security guy thinks he'll never see him again, but that is fine.
Next day, there is the kid but he is walking back across the border this time. Not the usual way.
"Show me the $500."
Boarder security pulls out the wad of cash, hands it to him. "Ok, there, now what have you been smuggling?"
"Bicycles."
