An elderly couple visited a Mexican border town.

They came upon a vendor who had a human skull for sale. 

They inquired and was told it was Pancho Villas skull.

It was for sale for $100.  They bought it.

A year later they returned to shop and found

the same vendor. He has a small skull for sale.

They were told it was Pancho Villas skull.

They asked how could this be, being they had

bought his skull last year?

The vendor replies, “Oh, this is his skull when  he

was a little boy.”