If you don't cut a croissant BEFORE you put it in the oven, it explodes in a mess of unsatisfying flaky bits and then it's impossible to drown it in butter and raspberry jam 
I am an intelligent woman with a slight obsession about making sure everything I do is as efficient as possible.
Yet it appears IMPOSSIBLE for me to learn this specific lesson. We've had Friday croissants for at least 2 years now and I've just spent the last 10 minutes desperately chasing little crumbs around my plate with a wet finger.