There is a specific / very specific case missing here - Working on the Trading Floor. I have found that the general noise + energy level of a Floor gives you a

There is a specific / very specific case missing here - Working on the Trading Floor. I have found that the general noise + energy level of a Floor gives you a natural high and it also drowns out individual Phone calls + conversations (which tend to be the most distracting). Additionally, in my case i only get interrupted via email and very rarely via IM, so it works for me. Failing that - a quiet co-working space is best.