Wikipedia:Don't stuff beans up your nose

As an old story goes:

The little boy's mother was going off to the market. She worried about her son, who was always up to some mischief. She sternly admonished him, "Be good. Don't get into trouble. Don't eat all the chocolate. 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 previous 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 actions, we may put forth ideas they have not entertained before. It may be wise not to caution against such possibilities. Prophylactic admonition may trigger novel mischief. As the popular saying goes, "don't give 'em any ideas". In other words, don't give examples of how to cause disruption (e.g., don't go to this link or you will crash Wikipedia) because this may will actually tempt people to do it.^{[Note 1]} So, the boy's mother could have considered saying the following instead:

Keep your nose clean!^{[Note 2]}