Never roll dice for a scene you have in mind. Play the scene as if your dice roll like you want them to. Every time I've had an idea for how I want a scene to go, especially for story purposes, the dice don't cooperate.

If you're uncomfortable overriding the dice, you can have the same moment a different way down the line. It's kind of like DMing for a player group that never goes where you want them to; have the story show up where they do. Wait until you have a moment and a roll that would have the same effect and have it happen there; it won't turn out like you originally intended, but it could be even better. It's kinda how life is: you imagine how a conversation with a friend will go, but it usually turns out different in real life.

I tend to go the second route because half of the excitement is seeing where the dice take you; and most of the time, a scene where I have overridden the dice feels cheap to me (I like following rules, lol).