You know the one.
The one you make when you're rewriting a feature-length script and in a trivial bit of scene description on page 86, your main character unexpectedly finds himself with something in his hand that changes everything.
It raises the stakes, strengthens his motivation and provides a poignant bit of dramatic irony that fits perfectly. It also means you're going to have to go back to page one and retrofit the whole script.
So you emit a cross between the hoot of an excited chimp and the groan of an England fan who's just seen the Germans sashay leisurely through the John Terry-shaped hole in the team's defence.
Yeah. That noise.