If you have an impulse, not if you're going to ruin someone elses' scene, if you have an impulse of a funny little add-on or taking something in a weird direction, try it. ↗
I've turned down jobs because I've said, 'Honestly, I can't find my way in. I can't do it. I love you, as a director. I think the script is good. You deserve better than I think I can do.' ↗