Once a greengrocer and a potter jointly hired a camel and each filled one side of the pannier with his goods. The camel as he went along the road took a mouthful every now and then, as he had a chance, from the greengrocer's bag of vegetables. This provoked a laugh from the potter, who thought he had the best of the bargain.
But the time came for the camel to sit, and he naturally sat on the heavier side, bearing down on the pots, and also to have his mouth free to operate on the bag of greens. This caused the pots to break in the bag, and then the greengrocer had all the laugh to himself.