The donkey gift.

Steve is not a bright man but has the best of intentions. He vacations to Mexico where he loses his passport, and get stuck in Mexico for a few months waiting to get his papers cleared up. A nice Mexican family takes him in and provides for him. When he hears the US embassy has cleared things up and he can go home the next day, he goes into town and buys a donkey and a bucket of tar. On the way back he sees a freshly cut field. He stops and begins covering the donkey in the tar. Once the donkey is sufficiently covered, he pushes the donkey over in the field. The donkey rolls around getting covered in the fresh cut clippings, and makes it back to its feet. He continues back to his host's home where he gives them the donkey as he says his goodbyes. The whole family is so confused by his gesture but politely accepts the donkey and wishes him the best. After he leaves, the family starts taking about the odd gift. One of the kids speaks up and says "I probably should have been more clear when he asked what people in Mexico do to say Thank you.