To roll or not to roll

LotFP: RPG: How I Run a Game: “But if I want something to happen, then I’ll say it happens and not bother with a dice roll.”

I haven’t finished reading that post—or many of his because they’re all so long—but this bit is interesting to me.

The thing for me is that sometimes I don’t know how much I think something should go one way until I roll the dice and it goes the other way. Dunno why.