There was a farmer who grew watermelons. He was doing pretty well, but he was disturbed by some local kids who would sneak into his watermelon patch at night and eat his watermelons.
After some careful thought, he came up with a clever idea that he thought would scare the kids away for sure. He made up a sign and posted it in the field. The next night, the kids showed up and they saw the sign which read, "Warning! One of the watermelons in this field has been injected with cyanide."
The kids ran off, made up their own sign and posted it next to the farmer's.
When the farmer returned, he surveyed the field. He noticed that no watermelons were missing, but the sign next to his read: "Now there are two!"
Two doctors, Dean and Gable, are treating a man with lung disease. They’re explaining how his smoking weed has led to his condition worsening.
“But it’s just herbal!” the patient protested. “How can it be bad?”
Dr. Jenkins sighed. “Nature isn't all innocent. Apricot stones contain lethal amounts of cyanide. There is a certain plant in my back garden - if you sit under it for just 5 minutes, you will die. Just because it’s natural doesn’t mean it’s safe for you!”
The man seemed to accept that, and promised to stop his smoking.
After he left, the doctors went to lunch. As they were sitting down to eat, Dr. Smith asked, “Oh by the way, what IS that plant that kills you if you sit under it?”
“A water lily."