Grocer- "Don't buy any more barrels of a...

Grocer- "Don't buy any more barrels of apples from that farmer." Clerk--' Very well, sir. Why'? Doesn't he put the large apples on the top and the little ones at the bottom?" Grocer- "Tes, but he forgets to indicate whieh is the top, and that's three times I've opened the bottoms of barrels to show customers-"