In the book, "El Palestino", there is a story about a well known smuggler along the border of Venezuela and Columbia.

The smuggler would show up at a terrorist camp and spend the night. While the smuggler slept, the others searched the saddle bags, but found nothing out of the ordinary.

Much later, the author met up with the smuggler and the author asked what he was smuggling. The smuggler looked around, and in a hushed voice said, "Donkeys".