A boy riding a bicycle was crossing the country border
The border guard stopped him and checked his bag
Found nothing but a bag of salt, guard let him go

Again next day the boy was riding a bicycle
With a bag of salt, the guard let him go again
This same process went on and on, for weeks

One day the guard checked him
To see if it was real salt or drugs
After some test, the guard found out,
That it was simple salt and nothing else