I have known young people (10-20 years), almost all male, who will respond to a caution about "don't do X" by immediately doing X. Fairly recently, I had to physically restrain a young man (by stepping in front of him) to prevent him from reaching out and grabbing some live electrical wires, right after I warned him about the hazard.
In many cases, certainly not all, this is not deliberate misbehavior. It seems to be unconscious behavior! It's like mentioning X trips some circuit in their heads, triggering an immediate impulse to do X. It doesn't matter if you add "don't do" to X, or not. They aren't thinking, just reacting. Falls squarely into Milland's category of "lack of impulse control".
Usually, this sort of behavior fades away by the time they get their mid-20s, unless they are gunning hard for a Darwin Award. "Hold my beer and watch this..." Such people are a serious liability in any occupation with serious hazards to themselves or others, and that includes driving in traffic!