Don't worry I think your fleeting thoughts are normal so long as they aren't interfering with your day to day functioning.

It's just a reminder to you of what is acceptable - and that's not a bad thing.

Your imagination of running around in the class was your brains way of evaluating outcomes and considering the consequences of your actions. That's a good thing! People can engage in all sorts of risk taking behaviors if they've never taught themselves to consider the consequences of their actions.

Just keep a healthy balance.

Don't let your imagination run that wild that it inhibits you from being you.