Doris at Courage to Grow has an interesting post about Steven Slater, the flight attendant who made the news going down the escape slide after a quarrel with a passenger.
What challenged me was her point that Slater had cherished this fantasy for years, and when the situation presented itself, he acted it out. In my own heart, I can see some dangerous daydreams that keep coming back. How do I not cherish them like Slater did? A simple resolution that I won't think about X only goes so far. It feels paradoxical, like the witticism that says "Whatever you do, don't think about a blue elephant." We hear that and we start thinking about a blue elephant in the act of trying not to think about one.
I have found a real benefit in laying my dangerous daydreams before God in prayer. The temptation is not to admit my weakness, to think it is all a matter of my will power to resist the daydream. But when life is to be lived in relationship to God, I should have the honesty to admit to Him I am the weak person that I am, tempted by the things I am tempted by. My wierd daydreams are no surprise to him, I might as well admit what tempts me. I have felt peace when I have done that.
Another thing I have thought about is to think more broadly than just "not thinking about X". I try to think about the positive things that indulging my daydream of X would destroy or diminish.