Every week, the same biker shows up and crosses the US / Canada border carrying two bags of sand.
Every week, the bags get investigated by the border police, but there’s nothing out of the ordinary. Just two bags of sand.
This goes on for two solid years. Week in, week out. Same guy, same crossing, same two bags of sand.
Finally, on his last day before retiring, the border officer just HAS to say something when the biker stops once again.
"Sir," says the officer, "this is my last day on the job and I have to ask, it’s been driving me nuts. I promise not to tell anyone. I know you’re up to something… What are you smuggling?"
The man gives the officer a grin and motions for him to come closer.
He whispers in his ear.