Vipul and Border guard Gul.
This is copy+paste topic with little editing.
One day Vipul comes up 2 the Pakistan border on his bike. He's got 2 large bags on his bike. The Border guard Gul stops him n ask,
What's in the bags? Vipul answered
Sand. Gul says,
Let me check that, Get off the bike.
Gul's takes the bags n he empties them out n finds nothing in them but sand. He detains Vipul all night n has the sand analyzed n discover that there is nothing but pure sand in the bags. Gul releases Vipul n lets him cross the border.

A week later, the same thing happens. Gul asks,
What have you got?.. 'Sand'... says the Vipul. Gul does his thorough examination n discovers that the bags contain nothing but sand.
This sequence of events is repeated every day for three years. 
Finally, Vipul doesn't show up few days n Gul meets him in a coffee shop in Islamabad. Hey buddy... says Gul,
I know you are smuggling something. It's driving me crazy. It's all I think about... I can't sleep. Just between u n me, what r u smuggling?
Vipul sips his coffee n answered,
Bikes