Wikipedia:Don't stuff beans up your nose
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- The little boy's mother was off to market. She worried about her boy, who was always up to some mischief. She sternly admonished him, "Be good. Don't get into trouble. Don't eat all the cabbage. Don't spill all the milk. Don't throw stones at the cow. Don't fall down the well." The boy had done all of these things on other market days. Hoping to head off new trouble, she added, "And don't stuff beans up your nose!" This was a new idea for the boy, who promptly tried it out.
In our zeal to head off others' unwise action, we may have ideas they have not entertained. It may not be wise to caution against such possibilities. Prophylactic admonition may trigger novel mischief. As the popular saying goes, "don't give him any ideas [for more mischief]."
In other words, don't give examples of how to cause disruption (e.g. "don't click on this link or you will crash Wikipedia") because this may actually tempt some people to do it.