Brain Fertilizer

The police had been after Doyle Bertram Walker for marijuana trafficking for some time, but to no avail. He was too clever, and too slippery.

One day a farmer called late Friday afternoon to say he'd found some hemp-looking plants growing near one of his fields. The young detective who took the call immediately ordered a stake-out to keep an eye on the marijuana, hoping Doyle would eventually show up and they could nab him. But they saw absolutely nothing over the whole weekend.

The senior detective was furious when he arrived Monday morning. He called the young detective into his office and yelled at him for hours about wasted man-hours.

"You should have known better!" he finally shouted.

"How, sir? How could I have known?" asked the perplexed young detective.

"Because," replied his superior,*

*"Watched pot is never Doyle's."