I'm not talking about ideas that your Muse really really really likes and which hang around in your head until you find some way to force them onto the page. Those can be nasty because just because they are persistent doesn't mean they are any good, or even ideas for a complete story, or that they will meekly join up with the rest of the story idea when you try to force them out of your head. Or that the end product will be any good when you're done.
Other ideas, however, think they are bright, sparkly, wonderful ideas for a story. (Sometimes they are the same idea.) And often enough they are right -- dramatic, inspiring wonder, all that fun stuff. But you still have to force them onto the paper. And ensure you have characterization and rising action and a hook and foreshadowing and all that fun writing technique stuff to make the story actually work.
And these ideas are particularly recalcitrant. Too busy oohing over all the wonderful things they could introduce into the world without any questions of how these concepts would fit. . . .