A man was standing in a gallery, studying two near-identical pictures by the same artist. Both showed a glass of wine, a basket of bread rolls, a bowl of salad and a plate of smoked salmon.

Yet one painting was priced $150, the other at $125.

So, he asked the gallery owner to explain why one was more expensive than the other.

"Its simple," said the gallery owner, indicating the more expensive painting.

"You get two extra slices of smoked salmon in that one."