Econometrics
Noise is everywhere and people make it all the time. Black argues that econometrics is filled with it in the forms of unobservables and mis-measurement. No matter how many variables one puts into a model, there are always more to add but can't (ones you can't observe) and the ones you have will always have error. This is how noise manifests in econometrics (as well as poor interpretation of regressions, such as assuming correlation means causation).
Read more about this topic: Noise (economic)